D1240-B Crydom - Relays

D1240-B Description

The Crydom D1240-B is a solid state relay, rated for 120 V and 40 A. Typical uses include temperature control of heaters, packaging and plastics machinery, and general industrial load switching.

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Summary of Features

Target Applications

Crydom D1240-B 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-B is a 40 A Series 1 120 VAC (Generation 3) panel-mount solid state relay, SCR output, normally closed (Form B) output, DC control (3-32 VDC). Source: Crydom Series 1 120 VAC Generation 3 datasheet. Values at 25°C unless noted.

Parameter	Value
Output
Operating voltage (47-63 Hz)	24-140 Vrms
Maximum load current	40 Arms
Transient overvoltage	400 Vpk
Minimum load current	40 mArms
Maximum 1 cycle surge current (50/60 Hz)	597/625 Apk
Maximum on-state voltage drop @ rated current	1.6 Vpk
Maximum off-state leakage @ rated voltage	8 mArms
Minimum off-state dv/dt	500 V/µs
Thermal resistance junction to case (Rjc)	0.63 °C/W
Maximum I²t for fusing (1/2 cycle, 50/60 Hz)	1779/1621 A²s
Output	Normally closed (Form B)
Input
Control voltage range	3-32 VDC
Turn-on / turn-off voltage	3.0 VDC / 1.0 VDC
Typical input current	3.4-20 mA
Nominal input impedance	1500 Ohm
General
Dielectric strength, input/output/base	4000 Vrms
Ambient operating temperature	-40 to 80°C
Weight (typical)	3 oz (86.5 g)

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