Switches & Pilot Lights Signaling Lights Relays & Sockets Timers Contactors Terminal Blocks Circuit Breakers RY/RM Relays & Sockets RY/RM Series Miniature Relays Key features: • RY2 (3A), RY4 (5A), RM2 (5A) • General purpose miniature relays • 3A or 5A contact capacity • Wide variety of terminal styles and coil voltages meet a wide range of applications • All 4PDT types have arc barriers. Part Number Selection Part Number Contact Model Plug-in Terminal PC Board Terminal Coil Voltage Code Standard RY2S-U 0 RY2V-U 0 DPDT (Slim) 3A With Indicator RY2S-UL 0 RY2V-UL 0 AC6V, AC12V, AC24V, AC110V, AC120V, With Check Button RY2S-UC 0 AC220V, AC240V DC6V, DC12V, D24V, DC48V, DC110V With Indicator and Check Button — RY2S-ULC 0 Top Bracket Mounting RY2S-UT 0 With Diode (DC coil only) DC6V, DC12V, DC24V, DC48V, DC110V RY2S-UD 0 RY2V-UD 0 Standard RM2S-U 0 RM2V-U 0 DPDT (Wide) 5A With Indicator RM2S-UL 0 RM2V-UL 0 RYAC6V, AC12V, AC24V, AC110-120V, AC220-240V With Check Button RM2S-UC 0 DC6V, DC12V, DC24V, DC48V, DC100-110V With Indicator and Check Button RM2S-ULC 0 Top Bracket Mounting — RM2S-UT 0 With Diode (DC coil only) RM2S-UD 0 DC6V, DC12V, DC24V, DC48V, DC100-110V With Indicator and Diode (DC coil only) RM2S-ULD 0 Standard RY4S-U 0 RY4V-U 0 With Indicator RY4S-UL 0 RY4V-UL 0 4PDT 5A AC6V, AC12V, AC24V, AC110-120V, With Check Button RY4S-UC 0 AC220-240V DC6V, DC12V, DC24V, DC48V, DC100-110V With Indicator and Check Button RY4S-ULC 0 Top Bracket Mounting RY4S-UT 0 — With Diode (DC coil only) RY4S-UD 0 DC6V, DC12V, DC24V, DC48V, DC100-110V With Indicator and Diode (DC coil only) RY4S-ULD 0 Top mount models are designed to mount directly to a panel and do not require a socket. Ordering Information When ordering, specify the Part No. and coil voltage code: (example) RY4S-U AC110-120V Part No. Coil Voltage Code 800-262-IDEC (4332) • USA & Canada 799 RY/RM Relays & Sockets Sockets Standard DIN Finger-safe DIN Relays Through Panel Mount PCB Mount Rail Mount Rail Mount RY2S SY2S-05 SY2S-05C SY2S-51 SY2S-61 RM2 SM2S-05 SM2S-05C SM2S-51 SY4S-61 SY4S-62 RY4S SY4S-05 SY4S-05C SY4S-51 Hold Down Springs & Clips For DIN For Through Panel & Appearance Item Relay Mount Socket PCB Mount Socket RY2S SY2S-02F1 SY4S-51F1 Pullover Wire RM2 Spring SY4S-51F1 SY4S-51F1 RY4S RY2S 1 Leaf Spring 2 SFA-202 SFA-302 (side latch) RM2, RY4S RY2S 1 Leaf Spring 2 RM2 SFA-101 SFA-301 (top latch) RY4S 1. Not available for PCB mount socket SY4S-62. 2. Order 2 pieces per relay. Accessories Item Appearance Use with Part No. Remarks The BNDN1000 is designed to accommodate DIN mount sockets. Aluminum Made of durable extruded aluminum, the BNDN1000 measures 0.413 DIN Rail All DIN rail sockets BNDN1000 (10.5mm) in height and 1.37 (35mm) in width (DIN standard). Standard (1 meter length) length is 39” (1,000mm). DIN Rail End DIN rail BNL5 9.1 mm wide. Stop Replacement Horseshoe clip for all DIN rail For use on DIN rail mount socket when using pullover wire hold down Hold-Down Y778-011 sockets spring. 2 pieces included with each socket. Spring Anchor www.IDEC.com 800 Circuit Breakers Terminal Blocks Contactors Timers Relays & Sockets Signaling Lights Switches & Pilot Lights Switches & Pilot Lights Signaling Lights Relays & Sockets Timers Contactors Terminal Blocks Circuit Breakers RY/RM Relays & Sockets Specifications Standard Contact Contact Model RY2 - DPDT Slim RM2 - DPDT Wide RY4 - 4PDT Contact Material Gold-plated silver Silver Gold-plated silver 1 Contact Resistance 50 mΩ maximum 30 mΩ maximum 50 mΩ maximum 24V DC, 5 mA; 5V DC, 24V DC, 10 mA; 5V DC, 24V DC, 5 mA; 5V DC, Minimum Applicable Load 10 mA (reference value) 20 mA (reference value) 10 mA (reference value) 2 Operating Time 20 ms maximum 2 Release Time 20 ms maximum Power Consumption AC: 1.1 VA (50 Hz), 1 VA (60 Hz) AC: 1.4 VA (50 Hz), 1.2 VA (60 Hz) AC: 1.4 VA (50 Hz), 1.2 VA (60 Hz) (approx.) DC: 0.8W DC: 0.9W DC: 0.9W Insulation Resistance 100 MΩ minimum (500V DC megger) Between live and dead parts: 1500V AC, 1 minute 2000V AC, 1 minute 2000V AC, 1 minute Between contact and coil: 1500V AC, 1 minute 2000V AC, 1 minute 2000V AC, 1 minute Dielectric Strength Between contacts of different poles: 1500V AC, 1 minute 2000V AC, 1 minute 2000V AC, 1 minute Between contacts of the same pole: 1000V AC, 1 minute 1000V AC, 1 minute 1000V AC, 1 minute Electrical: 1800 operations/h maximum Operating Frequency Mechanical: 18,000 operations/h maximum Damage limits: 10 to 55 Hz, amplitude 0.5 mm Vibration Resistance Operating extremes: 10 to 55 Hz, amplitude 0.5 mm 2 Damage limits: 1000 m/s Shock Resistance 2 2 Operating extremes: 100 m/s (DPDT Slim), 200 m/s (4PDT, DPDT Wide) Mechanical Life 50,000,000 operations 100,000 operations (220V AC, 5A) Electrical Life 200,000 operations (220V AC, 3A) 500,000 operations (220V AC, 5A) 200,000 operations (220V AC, 3A) 3 4 Operating Temperature –25 to +55°C (no freezing) –25 to +45°C (no freezing) –25 to +55°C (no freezing) Operating Humidity 45 to 85% RH (no condensation) Weight (approx.) 23g 35g 34g Note: Above values are initial values. 3. For use under different temperature conditions, refer to Continuous Load 1. Measured using 5V DC, 1A voltage drop method Current vs. Operating Temperature Curve. The operating temperature range 2. Measured at the rated voltage (at 20°C), excluding contact bouncing of relays with indicator or diode is –25 to +40°C. Release time of relays with diode: 40 ms maximum 4. When the total current of 4 contacts is less than 15A, the operating tem- perature range is –25 to +70°C. 800-262-IDEC (4332) • USA & Canada 801 RY/RM Relays & Sockets AC Coil Ratings Rated Current (mA) ±15% at 20°C Coil Resistance (Ω) ±10% Operation Characteristics at 20°C (against rated values at 20ºC) AC 50Hz AC 60Hz Voltage (V) DPDT DPDT Wide & DPDT DPDT Wide & DPDT DPDT Wide & Max. Continuous Pickup Dropout Slim 4PDT Slim 4PDT Slim 4PDT Applied Voltage Voltage Voltage 6 170 240 150 200 18.8 9.4 12 86 121 75 100 76.8 39.3 24 42 60.5 37 50 300 153 110 9.6 — 8.4 — 6,950 — 30% 110-120 — 9.4-10.8 — 8.0-9.2 — 4,290 110% 80% maximum minimum 120 8.6 — 7.5 — 8,100 — 220 4.7 — 4.1 — 25,892 — 220-240 — 4.7-5.4 — 4.0-4.6 — 18,820 240 4.9 — 4.3 — 26,710 — DC Coil Ratings Rated Current (mA) Coil Resistance (Ω) Operation Characteristics ±15% at 20°C ±10% at 20°C (against rated values at 20ºC) Voltage (V) Max. Continuous Pickup Dropout DPDT Slim DPDT Wide & 4PDT DPDT Slim DPDT Wide & 4PDT Applied Voltage Voltage Voltage 6 128 150 47 40 12 64 75 188 160 24 32 36.9 750 650 110% 80% maximum 10% minimum 48 18 18.5 2,660 2,600 100-110 — 8.2-9.0 — 12,250 110 8 — 13,800 — Contact Ratings UL Ratings Maximum Contact Capacity Resistive General use Voltage Allowable Contact Power Rated Load DPDT DPDT DPDT DPDT Continuous 4PDT 4PDT Contact Slim Wide Slim Wide Current Resistive Load Inductive Load Voltage (V) Res. Load Ind. Load 240V AC 3A 5A 5A 0.8A 2A 5A 110V AC 3A 1.5A DPDT Slim 660 VA AC 176 VA AC 120V AC — — — 1.5A 2.5A — 3A 220V AC 3A 0.8A (RY2) 90W DC 45W DC 100V DC 0.2A 0.4A 0.2A 0.2A — 0.2A 30V DC 3A 1.5A 30V DC 3A 5A 5A 3A — 5A 110V AC 5A 2.5A DPDT Wide 1100VA AC 440VA AC 5A 220V AC 5A 2A (RM2) 150W DC 75W DC CSA Ratings 30V DC 5A 2.5A Resistive General use 240V AC 5A 1.2A 1200 VA AC 288 VA AC Voltage DPDT DPDT DPDT DPDT 4PDT (RY4) 5A 4PDT 4PDT 150W DC 60W DC 30V DC 5A 2A Slim Wide Slim Wide Note: Inductive load for the rated load — cos ø = 0.3, L/R = 7 ms 240V AC 3A 5A 5A 0.8A 2A 5A 120V AC 3A 5A — 1.5A 2.5A — TÜV Ratings 100V DC — — — 0.2A 0.4A 0.2A DPDT DPDT 30V DC 3A 5A 5A 1.5A 2.5A 1.5A Voltage 4PDT Slim Wide 240V AC 3A 5A 5A 30V DC 3A 5A 5A AC: cos ø = 1.0, DC: L/R = 0 ms www.IDEC.com 802 Circuit Breakers Terminal Blocks Contactors Timers Relays & Sockets Signaling Lights Switches & Pilot Lights Switches & Pilot Lights Signaling Lights Relays & Sockets Timers Contactors Terminal Blocks Circuit Breakers RY/RM Relays & Sockets Socket Specifications Sockets Terminal Electrical Rating Wire Size Torque SY2S-05 M3 screws with captive wire clamp 300V, 7A Maximum up to 2–#14AWG 5.5 - 9 in•lbs DIN Rail Mount SM2S-05 M3 screw with captive wire clamp 300V, 10A Maximum up to 2–#14AWG 5.5 - 9 in•lbs Sockets SY4S-05 M3 screw with captive wire clamp 300V, 7A* Maximum up to 2–#14AWG 5.5 - 9 in•lbs SY2S-05C M3 screws with captive wire clamp, fingersafe 300V, 7A Maximum up to 2–#14AWG 5.5 - 9 in•lbs Finger-safe DIN Rail SM2S-05C M3 screw with captive wire clamp, fingersafe 300V, 10A Maximum up to 2–#14AWG 5.5 - 9 in•lbs Mount SY4S-05C M3 screw with captive wire clamp, fingersafe 300V, 7A* Maximum up to 2–#14AWG 5.5 - 9 in•lbs SY2S-51 Solder 250V, 7A — — Through Panel Mount SM2S-51 Solder 250V, 10A — — Socket SY4S-51 Solder 250V, 7A* — — SY2S-61 PCB Mount 300V, 7A — — PCB Mount SY4S-61 PCB Mount 300V, 7A — — Socket SY4S-62 PCB Mount 250V, 7A — — * When using only 2 poles of the 4-poles, the UL recognized current is 10A. 800-262-IDEC (4332) • USA & Canada 803 RY/RM Relays & Sockets Characteristics (Reference Data) Electrical Life Curves AC Load (RY2) (RY4) 1000 1000 110V AC resistive 500 500 220V AC resistive 240V AC resistive 200 200 100 100 240V AC inductive 50 50 20 20 110V AC inductive 220V AC inductive 10 10 0 1 2 3 4 5 0 1 2 3 Load Current (A) Load Current (A) 110V AC resistive (RM2) 220V AC resistive 1000 500 100 50 110V AC inductive 220V AC inductive 10 0 1 2 3 4 5 Load Current (A) DC Load ` (RY2) (RY4) 30V DC resistive 1000 1000 30V DC inductive 500 500 200 30V DC resistive 200 100 100 30V DC inductive 50 50 20 20 100V DC resistive 100V DC inductive 10 10 0 1 2 3 4 5 0 5 2 3 Load Current (A) Load Current (A) (RM2) 30V DC resistive 30V DC inductive 1000 500 100 50 100V DC resistive 100V DC inductive 10 0 1 2 3 4 5 Load Current (A) www.IDEC.com 804 Circuit Breakers Terminal Blocks Contactors Timers Relays & Sockets Signaling Lights Switches & Pilot Lights Life (¥ 10,000 operations) Life ( ¥ 10,000 operations) Life (¥ 10,000 operations) Life (¥ 10,000 operations) Life (¥ 10,000 operations) Life ( ¥ 10,000 operations) Switches & Pilot Lights Signaling Lights Relays & Sockets Timers Contactors Terminal Blocks Circuit Breakers RY/RM Relays & Sockets Maximum Switching Capacity AC resistive (RY4) (RY2) AC inductive 5 5 3 3 AC resistive 2 AC DC resistive inductive 1 1 DC resistive DC inductive 0.5 0.5 DC inductive 0.3 0.2 0.1 1 10 20 30 50 100 200 300 1 5 10 50 100 200 300 Load Voltage (V) Load Voltage (V) (RM2) 5 AC resistive AC inductive DC 1 DC inductive resistive 0.5 0.1 1 5 10 50 100 200 300 Load Voltage (V) Continuous Load Current vs. Operating Temperature Curve (Standard Type, With Check Button, and Top Bracket Mounting Type) (RM2) 100 (RY2) 100 (RY4) 100 90 90 90 80 80 80 DC Coil DC Coil 70 DC Coil 70 70 60 60 60 50 AC Coil 50 50 AC Coil AC Coil 40 40 40 30 30 30 20 20 20 10 10 10 0 0 0 1 2 3 1 2 3 1 2 3 4 5 Load Current (A) Load Current (A) Load Current (A) 800-262-IDEC (4332) • USA & Canada 805 Operating Temperature (C) Load Current (A) Load Current (A) Operating Temperature (C) Load Current (A) Operating Temperature (C) RY/RM Relays & Sockets Internal Connection (View from Bottom) Standard Type DPDT Slim (RY2) DPDT Wide (RM2) 4PDT (RY4) With Check Button Front Pushbutton Contacts can be operated by pressing the check button. With Indicator (-L type) DPDT Slim (RY2) DPDT Wide (RM2) 4PDT (RY4) Coil Coil Below Below When the relay is energized, 100V 24V AC/ the indicator goes on. AC/DC DC • An LED protection diode is not contained in DPDT relays for coils below 100V DC. Coil • If coil polarity is reversed Coil 24V 100V LED will not light. AC/DC AC/DC and over and over With Diode (-D type) DPDT Slim (RY2) DPDT Wide (RM2) 4PDT (RY4) Contains a diode to absorb the back emf gener- ated when the coil is de-energized. The release time is slightly longer. • Diode Characteristics Reverse withstand voltage: 1,000V Forward current: 1A With Indicator and Diode (-LD type) DPDT Wide (RM2) 4PDT (RY4) DPDT Wide (RM2) 4PDT (RY4) 1 4 1 2 3 4 5 8 5 6 7 8 Coil Coil 24V Contains an LED 9 12 9 10 11 12 Below DC and indicator and a surge 24V DC over absorber. 13(–) (+)14 13(–) (+)14 www.IDEC.com 806 Circuit Breakers Terminal Blocks Contactors Timers Relays & Sockets Signaling Lights Switches & Pilot Lights Switches & Pilot Lights Signaling Lights Relays & Sockets Timers Contactors Terminal Blocks Circuit Breakers RY/RM Relays & Sockets Dimensions (mm) RY2S RY4S RM2S Total length from the panel surface including relay socket. Total length from panel surface including relay socket Total length from the panel surface including relay socket SM2S-05: 61.5 (63.5) max., SM2S-51: 39.6 (41.6) max. SY2S-05: 61.5 (63.5) max., SY2S-51: 39.6 (41.6) max. SY4S-05: 61.5 (63.5) max., SY4S-51: 39.6 (41.6) max. Dimensions in the ( ) Dimensions in the ( ) 3 × ø1.2 oblong hole 2.2 × ø1.2 oblong hole Dimensions in the ( ) include a hold-down spring. include a hold-down spring. include a hold-down spring. 2.2 × ø1.2 hole 1 4 5 8 1 4 9 12 5 8 12 3 4 13 14 9 12 5 6 7 8 13 14 9 10 11 12 35.6 max. 6.4 21 13 14 35.6 max. 5.4 14 35.6 max. 6.4 21 RY2V RY4V RM2V 0.5 0.5 8-ø1 holes 0.5 14-ø1 holes 6.6 1 4 8-ø1 hole 5 8 9 12 1 2 3 4 13 14 5 6 7 8 1 4 9 10 11 12 5 8 13 14 9 12 35.6 max. 4 14 4.4 13 14 35.6 max. 4 21 4.4 4.4 13.2 4.4 35.6 max. 4 21 RY2S-UT RY4S-UT RM2S-UT 3 ¥ ø1.2 oblong hole 2.2 ¥ ø1.2 hole 2.2 ¥ ø1.2 oblong hole 1 4 1 4 5 8 1 2 3 4 5 8 5 6 7 8 9 12 9 12 9 10 11 12 13 14 13 14 13 14 3.5 2 3.5 2 3.5 2 14.5 35.6 max. 5.4 21.5 35.6 max. 6.4 21.5 35.6 max. 6.4 800-262-IDEC (4332) • USA & Canada 807 43.2 38 0.5 0.8 2.6 0.5 2.6 27.5 0.5 2.6 7.15 6.4 6.3 4.1 4.4 27.5 6.4 27.5 12.7 4.1 43.2 38 2.6 0.5 0.8 0.5 2.6 27.5 0.5 2.6 7.15 6.4 4.1 4.4 4.4 6.3 4.4 27.5 6.4 27.5 12.7 4.1 43.2 38 0.5 2.6 0.8 2.6 0.5 27.5 0.5 2.6 7.15 6.4 4.1 13.2 6.3 27.5 6.4 27.5 12.7 4.1 RY/RM Relays & Sockets Dimensions Standard DIN Rail Mount Sockets SY2S-05 SM2S-05 31.5 17 30 31.5 6 18 6 DIN Rail DIN Rail 18 M3 Terminal M3 Terminal (BNDN) Terminal Arrangement (BNDN) Terminal Arrangement Screw Screw 2-ø4.2 Mounting Holes 8 5 8 5 2-ø4.2 Mounting Holes (or M4 Tapped Holes) 4 1 (or M4 Tapped Holes) 4 1 16 26 14 13 4 max. 4.8 min. 14 13 4 max. 4.8 min. 12 9 12 9 ( ) 18.5 Top View (Top View) 16 14.5 5.9 max. 5.9 max. 26 25 20 25 ø3.2 min. ø3.2 min. SY4S-05 30 31.5 6 DIN Rail 18 M3 Terminal (BNDN) Terminal Arrangement Screw 2-ø4.2 Mounting Holes 8 7 6 5 (or M4 Tapped Holes) 4 3 2 1 26 4 max. 4.8 min. 14 13 12 11 10 9 ( ) 18.5 Top View 5.9 max. 26 25 ø3.2 min. Finger-safe DIN Rail Mount Sockets SY2S-05C SM2S-05C 17.2 30 35.5 M3 Terminal 35.5 DIN Rail 6 DIN Rail 6 Screw 25 Terminal Arrangement (BNDN) 25 M3 Terminal (BNDN) 2-ø4.2 Mounting Holes Screw Terminal Arrangement 8 5 2-ø4.2 Mounting Holes (or M4 Tapped Holes) 4 1 (or M4 Tapped Holes) 8 5 18 4 1 16 26 14 13 14 13 12 9 Ring terminals 12 9 ( ) Top View Ring terminals cannot be used. (Top View) 18.2 16 cannot be used. 18.2 26 29 20 29 SY4S-05C 30 35.5 M3 Terminal 6 DIN Rail 25 Screw (BNDN) Terminal Arrangement 8 7 6 5 2-ø4.2 Mounting Holes 18 4 3 2 1 (or M4 Tapped Holes) 26 14 13 12 11 10 9 Ring terminals (Top View) cannot be used. 18.2 26 29 www.IDEC.com 808 ø5.5 ø5 ø5.5 Circuit Breakers Terminal Blocks Contactors Timers Relays & Sockets Signaling Lights Switches & Pilot Lights 1.6 64 3 62 0.7 1.6 64 2 62 4.2 4.2 4.2 4.2 2 46 45 45 2 46 1.6 64 3 62 0.7 4.2 4.2 2 46 45 Switches & Pilot Lights Signaling Lights Relays & Sockets Timers Contactors Terminal Blocks Circuit Breakers 13.2 8.8 4.4 RY/RM Relays & Sockets Through Panel Mount Socket SY2S-51 SM2S-51 Panel Thickness: +0.5 Panel Thickness: +0.5 [18(N–1)+12.4] 0 [27 (N–1) + 21.4] 1 to 2 0 1 to 2 Terminal Arrangement Terminal Arrangement 1 4 1 4 5 8 5 8 9 12 13 14 9 12 13 14 27 3 N: No. of sockets mounted (Bottom View) 18 3 (Bottom View) N: No. of sockets mounted 11 11 18.7 18.7 * 10.4 min. when using hold-down springs 2.4 21.2 * 10.4 min. when husing hold-down springs 2.4 12.2 SY4S-51 Panel Thickness: +0.5 [27 (N–1) + 21.4] 0 1 to 2 Terminal Arrangement 1 2 3 4 5 6 7 8 10 11 12 9 13 14 27 3 (Bottom View) N: No. of sockets mounted 11 18.7 * 10.4 min. when using hold-down springs 2.4 21.2 PCB Mount Sockets SY2S-61 SY4S-61 13.2 13.6 min. 13.8 min. 4.4 8.8 Terminal Arrangement 4.4 1 4 Terminal Arrangement 5 8 1 2 3 4 9 12 5 6 7 8 13 14 9 10 11 12 13 14 (Bottom View) 18 3 27 3 (Bottom View) 11 8-ø2 holes 11 15 15-ø2 holes * 19.2 min. when using 15 (Tolerance 0.1) 1.5 hold-down springs (Tolerance 0.1) * 19.2 min. when using 1.5 12.2 hold-down springs 21.2 SY4S-62 8.2 min.** Terminal Arrangement 1 2 3 4 6 5 7 8 9 10 11 12 13 14 21.2 3 (Bottom View) 15-ø2 holes 11 15 (Tolerance 0.1) 1.5 * 17.2 min. when using a hold-down spring. 13.2 min. when using a hold-down spring for * * the relay with check button 800-262-IDEC (4332) • USA & Canada 809 31 31 29 31 0.3 0.3 0.3 25.4 25.4 0.3 25.4 +0.2 5.4 min.* 25.6 0 +0.2 14.2 min.* 16.8 5.4 min.* 25.6 0 12.2 min.* 16.8 10.4 10.4 1.4 4.1 4.1 9 9 31 31 0.3 0.3 25.4 25.4 +0.2 5.4 min.* 25.6 0 14.2 min.* 16.8 10.4 4.1 1.4 9 Switches & Pilot Lights Signaling Lights Relays & Sockets Timers Contactors Terminal Blocks Circuit Breakers Operating Instructions Relays & Sockets Operating Instructions Operating Instructions Driving Circuit for Relays Protection for Relay Contacts 1. To ensure correct relay operation, apply rated voltage to the relay coil. 1. The contact ratings show maximum values. Make sure that these values are not exceeded. When an inrush current flows through the load, the contact 2. Input voltage for the DC coil: may become welded. If this is the case, connect a contact protection circuit, A complete DC voltage is best for the coil power to make sure of stable relay such as a current limiting resistor. operation. When using a power supply containing a ripple voltage, suppress the ripple factor within 5%. When power is supplied through a rectification 2. Contact protection circuit: circuit, the relay operating characteristics, such as pickup voltage and dropout When switching an inductive load, arcing causes carbides to form on the voltage, depend on the ripple factor. Connect a smoothing capacitor for better contacts, resulting in increased contact resistance. In consideration of contact operating characteristics as shown below. reliability, contact life, and noise suppression, use of a surge absorbing circuit is recommended. Note that the release time of the load becomes slightly Pulsation longer. Check the operation using the actual load. Incorrect use of a contact protection circuit will adversely affect switching characteristics. Four typical Smoothing Emin Emax Emean DC Capacitor examples of contact protection circuits are shown in the following table: + R Relay Emax – Emin – Ripple Factor (%)¥ 100% This protection circuit can be used when the load Emean Emax = Maximum of pulsating current impedance is smaller than the RC impedance in an Emin = Minimum of pulsating current AC load power circuit. Emean = DC mean value Power Ind. Load CR • R: Resistor of approximately the same resistance value as the load 3. Leakage current while relay is off: • C:0.1 to 1 µF When driving an element at the same time as the relay operation, special consideration is needed for the circuit design. As shown in the incorrect This protection circuit can be used for both AC and DC load power circuits. circuit below, leakage current (Io) flows through the relay coil while the relay R: Resistor of approximately the same resistance is off. Leakage current causes coil release failure or adversely affects the value as the load vibration resistance and shock resistance. Design a circuit as shown in the C: 0.1 to 1 µF correct example. This protection circuit can be used for DC load power + Incorrect Correct circuits. Use a diode with the following ratings. TE R Power Reverse withstand voltage: Power voltage of the R D Ind. Load load circuit x 10 – Io Forward current: More than the load current This protection circuit can be used for both AC and DC load power circuits. 4. Surge suppression for transistor driving circuits: For a best result, when using a power voltage of 24 When the relay coil is turned off, a high-voltage pulse is generated, causing a Power Ind. Load to 48V AC/DC, connect a varistor across the load. transistor to deteriorate and sometimes to break. Be sure to connect a diode When using a power voltage of 100 to 240V AC/DC, to suppress the back electromotive force. Then, the coil release time becomes connect a varistor across the contacts. slightly longer. To shorten the coil release time, connect a Zener diode 3. Do not use a contact protection circuit as shown below: between the collector and emitter of the transistor. Select a Zener diode with a Zener voltage slightly higher than the power voltage. This protection circuit is very effective in arc suppression when Back emf suppressing diode opening the contacts. But, the capacitor is charged while the C contacts are opened. When the contacts are closed, the capacitor + Load Power R Relay is discharged through the contacts, increasing the possibility of – contact welding. This protection circuit is very effective in arc suppression when C Load opening the contacts. But, when the contacts are closed, a current Power flows to charge the capacitor, causing contact welding. Generally, switching a DC inductive load is more difficult than switching a DC resistive load. Using an appropriate arc suppressor, however, will improve the switching characteristics of a DC inductive load. Soldering 1. When soldering the relay terminals, use a soldering iron of 30 to 60W, and quickly complete soldering (within approximately 3 seconds). 2. Use a non-corrosive rosin flux. 800-262-IDEC (4332) • USA & Canada 817 Varistor Diode RC Varistor Operating Instructions Relays & Sockets Operating Instructions con’t Other Precautions 2. UL and CSA ratings may differ from product rated values determined by IDEC. 1. General notice: To maintain the initial characteristics, do not drop or shock the relay. 3. Do not use relays in the vicinity of strong magnetic field, as this may affect relay operation. The relay cover cannot be removed from the base during normal operation. To maintain the initial characteristics, do not remove the relay cover. Use the relay in environments free from condensation, dust, sulfur dioxide (SO ), and hydrogen sulfide (H S). 2 2 Make sure that the coil voltage does not exceed applicable coil voltage range. Safety Precautions • Turn off the power to the relay before starting installation, removal, wiring, Precautions for the RU Relays maintenance, and inspection of the relays. Failure to turn power off may • Before operating the latching lever of the RU relay, turn off the power to cause electrical shock or fire hazard. the RU relay. After checking the circuit, return the latching lever to the origi- • Observe specifications and rated values, otherwise electrical shock or fire nal position. hazard may be caused. • Do not use the latching lever as a switch. The durability of the latching lever • Use wires of the proper size to meet voltage and current requirements. Tight- is a minimum of 100 operations. en the terminal screws on the relay socket to the proper tightening torque. • When using DC loads on 4PDT relays, apply a positive voltage to terminals of • Surge absorbing elements on AC relays with RC or DC relays with diode are neighboring poles and a negative voltage to the other terminals of neighbor- provided to absorb the back electromotive force generated by the coil. When ing poles to prevent the possibility of short circuits. the relay is subject to an excessive external surge voltage, the surge absorb- • DC relays with a diode have a polarity in the coil terminals. Apply the DC volt- ing element may be damaged. Add another surge absorbing provision to the age to the correct terminals. relay to prevent damage. www.IDEC.com 818 Circuit Breakers Terminal Blocks Contactors Timers Relays & Sockets Signaling Lights Switches & Pilot Lights