D1240 Crydom - Relays

D1240 Description

D1240 is a 120 V, 40 A solid state relay made by Crydom. It is widely used for heater control, motor switching, lighting and process equipment where mechanical contacts would wear out.

USComponent (Young & New Century LLC) supplies power modules, thyristors, diodes and other industrial components, including legacy parts. Contact us for a quote on the D1240, and please confirm ratings against the datasheet before ordering.

Summary of Features

Target Applications

Crydom D1240 is used for switching AC loads in industrial heating and temperature control (ovens, furnaces, plastic molding and extrusion machines), packaging and food processing equipment, lighting control, HVAC systems and industrial automation.

Key Specifications

Crydom D1240 is a 40 A panel-mount solid state relay, Series 1 120 VAC (24-140 VAC), SCR output, DC control, zero voltage turn-on. Source: Crydom Series 1 120 VAC datasheet. Values at 25°C unless noted.

Parameter	Value
Output
Operating voltage (47-440 Hz)	24-140 Vrms
Maximum load current	40 Arms
Transient overvoltage	600 Vpk
Minimum load current	150 mArms
Maximum 1-cycle surge current (50/60 Hz)	597/625 Apk
Maximum on-state voltage drop @ rated current	1.15 Vrms
Maximum off-state leakage @ rated voltage	1 mArms
Minimum off-state dv/dt	500 V/µs
Maximum I²t for fusing, 1/2 cycle (50/60 Hz)	1770/1629 A²s
Thermal resistance junction to case (Rjc)	0.5 °C/W
Switching type	zero voltage turn-on
Input
Control voltage range	3-32 VDC
Minimum turn-on voltage	3.0 VDC
Must turn-off voltage	1.0 VDC
Input current	7-12 mA
Maximum turn-on / turn-off time	1/2 cycle / 1/2 cycle
General
Dielectric strength, input/output/base	4000 Vrms
Ambient operating temperature	-40 to 80°C
Weight (typical)	2.6 oz (74.9 g)

Technical document (PDF)  |  Request a quote for D1240 (reply within 24 hours)