Struthers-Dunn - 645S Series - Solid State On / Off Motor Relays

The 645S series of solid state relays uses back to back SCRs for on/control of three phase loads. Operation is three pole normally open. Inputs can be AC or DC operated. Load currents can range from 10 to 75 amps and up to a nominal voltage of 480VAC. Both random turn on or zero cross construction is available.

Additional contact configurations and coil options are available – please use the RFQ/RFI tab above to submit your request.

645S Series - Solid State On / Off Relays

645S Series - Solid State On / Off Relays - Dimensional Picture

Unit of Measure

Items	645SZ450-3-32VDC 645S Series - Solid State On / Off Motor Relays	645SZ475-3-32VDC 645S Series - Solid State On / Off Motor Relays	645SR450-3-32VDC 645S Series - Solid State On / Off Motor Relays	645SR475-3-32VDC 645S Series - Solid State On / Off Motor Relays	645SZ450-90-280VAC 645S Series - Solid State On / Off Motor Relays
Series	N/A 645S
Input Voltage	N/A 3-32 VDC	N/A 3-32 VDC	N/A 3-32 VDC	N/A 3-32 VDC	N/A 90-280 VAC
Input Characteristics	N/A DC	N/A DC	N/A DC	N/A DC	N/A AC
Must Release Voltage	N/A 1VDC	N/A 1VDC	N/A 1VDC	N/A 1VDC	N/A 10VAC
Maximum Input Current	N/A 80 mA	N/A 80 mA	N/A 80 mA	N/A 80 mA	N/A 30 mA
Reverse Polarity Protection	N/A Yes	N/A Yes	N/A Yes	N/A Yes	N/A
Output Characteristics	N/A 50 A	N/A 75 A	N/A 50 A	N/A 75 A	N/A 50 A
Rated Load Current (rms)	N/A 50 A	N/A 75 A	N/A 50 A	N/A 75 A	N/A 50 A
Min. Load current to maintain on	N/A 250 mA
Non-Repetitive Surge Current (1 cycle)	N/A 520 A	N/A 1150 A	N/A 520 A	N/A 1150 A	N/A 520 A
Maximum I2T for Fusing (Asquared sec)	N/A 1035A2 S	N/A 2600A2 S	N/A 1035A2 S	N/A 2600A2 S	N/A 1035A2 S
Suggested Heatsink	N/A 0.14 ºC/W+FAN(2)
Load Voltage Range	N/A 50 to 480VAC	N/A 51 to 480VAC	N/A 52 to 480VAC	N/A 53 to 480VAC	N/A 54 to 480VAC
Frequency Range	N/A 47 to 63 Hz	N/A 48 to 63 Hz	N/A 49 to 63 Hz	N/A 50 to 63 Hz	N/A 51 to 63 Hz
Peak Blocking Voltage	N/A 800 to 1200	N/A 801 to 1200	N/A 802 to 1200	N/A 803 to 1200	N/A 804 to 1200
Maximum Rate of Rise Off State Voltage (dv/dt)	N/A 500 V/uS	N/A 501 V/uS	N/A 502 V/uS	N/A 503 V/uS	N/A 504 V/uS
Max. Off state leakage current (rms)	N/A 10 mA
Max. On State Voltage Drop	N/A 1.8 VAC
Maximum Turn-On Time at 60 Hz	N/A 8.3 ms
Maximum Turn-Off Time at 60 Hz	N/A 8.3 ms
Dielectric Strength - I or O to case	N/A 4000 Vrms
Operating Temperature Range	N/A -30 to 80 ºC
Storage Temperature Range	N/A -40 to 100 ºC
Weight	N/A 320 g
Input Terminal Size	N/A M3.5
Output Terminal Size	N/A M4