A1240-B Crydom - Relays

A1240-B Description

The A1240-B is a solid state relay made by Crydom. Solid state relays like this switch heaters, motors, lamps and other loads quietly and without contact wear.

USComponent has sourced power semiconductors for maintenance teams and OEMs since 2001. For price and availability of the A1240-B, send us a request for quote. Please confirm the specifications against the manufacturer's datasheet before purchase.

Summary of Features

Target Applications

Crydom A1240-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 A1240-B is a 40 A Series 1 120 VAC (Generation 3) panel-mount solid state relay, SCR output, normally closed (Form B) output, AC control (90-280 Vrms). 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	90-280 Vrms
Turn-on / turn-off voltage	90 Vrms / 10 Vrms
Typical input current	2.0-4.0 mA
Nominal input impedance	60 kOhm
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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