A4840 Crydom - Relays

A4840 Description

Crydom A4840 is a solid state relay. 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 A4840 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 A4840 is a 40 A Series 1 panel-mount solid state relay (older generation), SCR output, 480 VAC line, AC control, zero voltage turn-on, Form A (normally open). Source: Crydom Series 1 bulletin 801B. Values at 25°C unless noted.

Parameter	Value
Output
Operating voltage	80-530 Vrms, 47-63 Hz
Maximum load current	40 Arms
Minimum load current	40 mArms
Transient overvoltage	800 Vpk
Maximum surge current (16.6 ms, non-repetitive)	625 Apk
Maximum over current (1 s, non-repetitive)	80 Arms
Maximum on-state voltage drop @ rated current	1.6 Vpk
Maximum I²t for fusing (8.3 ms)	1620 A²s
Thermal resistance junction to case (Rjc)	0.63 °C/W
Power dissipation @ maximum current	46 W
Maximum zero voltage turn-on	75 Vpk
Maximum off-state leakage @ rated voltage	10 mArms
Minimum off-state dv/dt	500 V/µs
Input
Control voltage range	90-280 Vrms (60 Hz)
Maximum turn-on / must turn-off voltage	90 Vrms / 10 Vrms
Input impedance	60 kOhm
Input current	2 mA @ 120 VAC, 4 mA @ 240 VAC
Maximum turn-on / turn-off time	10 ms / 40 ms
General
Dielectric strength, input/output/base	4000 Vrms
Ambient operating temperature	-30 to 80°C
Weight	4 oz max

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