A4825 Crydom - Relays

A4825 Description

The A4825 is 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 A4825, and please confirm ratings against the datasheet before ordering.

Summary of Features

Target Applications

Crydom A4825 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 A4825 is a 25 A panel-mount solid state relay, Series 1 480 VAC (48-530 VAC), SCR output, AC control (90-280 VAC), zero voltage turn-on. Source: Crydom Series 1 480 VAC datasheet. Values at 25°C unless noted.

Parameter	Value
Output
Operating voltage (47-440 Hz)	48-530 Vrms
Maximum load current	25 Arms
Transient overvoltage	800 Vpk
Minimum load current	150 mArms
Maximum 1-cycle surge current (50/60 Hz)	239/250 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)	285/259 A²s
Thermal resistance junction to case (Rjc)	0.8 °C/W
Switching type	zero voltage turn-on
Input
Control voltage range	90-280 Vrms
Minimum turn-on voltage	90 Vrms
Must turn-off voltage	10 Vrms
Input current	5-10 mA
Maximum turn-on / turn-off time	20 ms / 30 ms
General
Dielectric strength, input/output/base	4000 Vrms
Ambient operating temperature	-40 to 80°C
Weight (typical)	2.6 oz (74.9 g)

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