D4840B Crydom - Relays

D4840B Description

The D4840B from Crydom is a solid state relay with a 480 V / 40 A rating. Solid state relays like this switch heaters, motors, lamps and other loads quietly and without contact wear.

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Summary of Features

Target Applications

Crydom D4840B 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 D4840B is a 40 A Series 1 panel-mount solid state relay (older generation), SCR output, 480 VAC line, DC control, zero voltage turn-on, Form B (normally closed). 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	3-32 VDC
Maximum turn-on / must turn-off voltage	3.0 VDC / 1.0 VDC
Input impedance	1500 Ohm
Input current	3.4 mA @ 5 VDC, 20 mA @ 28 VDC
Maximum turn-on / turn-off time	8.3 ms / 8.3 ms
General
Dielectric strength, input/output/base	4000 Vrms
Ambient operating temperature	-30 to 80°C
Weight	4 oz max

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