The 645T series of solid state relays uses triacs for on/off 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 50 amps and up to a nominal voltage of 480VAC. Both random turn on or zero cross is available.

Additional contact configurations and coil options are available – please use the RFQ/RFI tab above to submit your request.
UL Recognized          RoHS Compliant
Unit of Measure



N/A 645T

Input Characteristics

Input Voltage

N/A 3-32 VDC

Input Characteristics


Must Release Voltage


Maximum Input Current

N/A 80 mA

Reverse Polarity Protection

N/A Yes

Output Characteristics

Output Characteristics

N/A 40 A

Min. Load current to maintain on

N/A 250 mA

Non-Repetitive Surge Current (1 cycle)

N/A 300 A

Maximum I2T for Fusing (Asquared sec)

N/A 450A2 S

Suggested Heatsink

N/A 0.14 ºC/W+FAN

Load Voltage Range

N/A 50 to 480VAC

Frequency Range

N/A 47 to 63 Hz

Peak Blocking Voltage

N/A 800 to 1200

Maximum Rate of Rise Off State Voltage (dv/dt)

N/A 250 V/uS

Max. Off state leakage current (rms)

N/A 10 mA

Max. On State Voltage Drop

N/A 1.6 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

Miscellaneous Characteristics

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


N/A 320 g

Input Terminal Size

N/A M3.5

Output Terminal Size

N/A M4