Product Details

200A 250A 300A 350A 400A Solid State Relay (Single phase Industrial grade)

Single phase Solid State Relay (SCR output)

Series GDH are power line relays allowing 200 to 400 Amps. switching power,with Voltage ratings from 280 to 480 Volts A.C. GDH series is Dual SCR Power Hybrid technology provides highly efficient thermal management for greatly increased cyclic life.

Features
High performance/low cost circuit design.
Logic compatible current regulated input.
2500 Vrms optical isolation.
Both “Zero Voltage” & phase controllable “Random Switching” versions.
High voltage (1200 Vpk) versions for 480 Vrms service.
LED-indication for control input.

Control voltage range:4~16 Vdc ,4 to 32 Vdc or 90~280Vac.

Symbol	Meaning
G	Greegoo
D	Single phase
H	SCR output
*	200-200A, 250-250A, 300-300A, 350-350A, 400-400A
*	28-280V,48-480V
*	Z-zero control, R-random control
*	D1-4-16Vdc, D3-4-32Vdc, A2-90-250Vac
For example:	GDH25048ZD3, single phase, SCR output, 250A，480Vac，4-32Vdc control

Voltage	Control voltage	Rated operational current
Voltage	Control voltage	200 Amp	250 Amp	300 Amp
280 VAC zero crossing	4 to 16 Vdc	GDH20028ZD1B	GDH25028ZD1B	GDH30028ZD1B
	4 to 32 Vdc	GDH20028ZD3B	GDH25028ZD3B	GDH30028ZD3B
	90 to 250Vac	GDH20028ZA2B	GDH25028ZA2B	GDH30028ZA2B
280 VAC random switching	4 to 16 Vdc	GDH20028RD1B	GDH25028RD1B	GDH30028RD1B
	4 to 32 Vdc	GDH20028RD3B	GDH25028RD3B	GDH30028RD3B
	90 to 250Vac	GDH20028RA2B	GDH25028RA2B	GDH30028RA2B
480 VAC zero crossing	4 to 16 Vdc	GDH20048ZD1B	GDH25048ZD1B	GDH30048ZD1B
	4 to 32 Vdc	GDH20048ZD3B	GDH25048ZD3B	GDH30048ZD3B
	90 to 250Vac	GDH20048ZA2B	GDH25048ZA2B	GDH30048ZA2B
480 VAC random switching	4 to 16 Vdc	GDH20048RD1B	GDH25048RD1B	GDH30048RD1B
	4 to 32 Vdc	GDH20048RD3B	GDH25048RD3B	GDH30048RD3B
	90 to 250Vac	GDH20048RA2B	GDH25048RA2B	GDH30048RA2B
		300 Amp	350 Amp	400 Amp
280 VAC zero crossing	4 to 16 Vdc	GDH30028ZD1B	GDH35028ZD1B	GDH40028ZD1B
	4 to 32 Vdc	GDH30028ZD3B	GDH35028ZD3B	GDH40028ZD3B
	90 to 250Vac	GDH30028ZA2B	GDH35028ZA2B	GDH40028ZA2B
280 VAC random switching	4 to 16 Vdc	GDH30028RD1B	GDH35028RD1B	GDH40028RD1B
	4 to 32 Vdc	GDH30028RD3B	GDH35028RD3B	GDH40028RD3B
	90 to 250Vac	GDH30028RA2B	GDH35028RA2B	GDH40028RA2B
480 VAC zero crossing	4 to 16 Vdc	GDH30048ZD1B	GDH35048ZD1B	GDH40048ZD1B
	4 to 32 Vdc	GDH30048ZD3B	GDH35048ZD3B	GDH40048ZD3B
	90 to 250Vac	GDH30048ZA2B	GDH35048ZA2B	GDH40048ZA2B
480 VAC random switching	4 to 16 Vdc	GDH30048RD1B	GDH35048RD1B	GDH40048RD1B
	4 to 32 Vdc	GDH30048RD3B	GDH35048RD3B	GDH40048RD3B
	90 to 250Vac	GDH30048RA2B	GDH35048RA2B	GDH40048RA2B

Dimension

200a to 500a single phase high power ssr dimension diagram

FAQ

Q:SCR output SSR and Triacs output SSR, what's their difference?

TRIAC Output SSR: Simple, cost-effective, and suitable for low to medium power AC load switching applications, particularly in consumer or light industrial settings. Limitations include lower performance and durability under high current/voltage and inability to regulate current.

SCR Output SSR: Uses dual SCRs, designed for high-power, high-voltage, and heavy-load applications with better thermal management, higher reliability, and longer lifespan. Supports both zero-crossing and random switching modes, and can regulate current, making it ideal for industrial applications but at a higher cost.

Q:Selection Guide for Solid State Relays

A margin should be left when selecting the voltage and current of the solid state relay.

For resistive load: the current is selected according to 2.5~4 times the load current, and the voltage is selected according to 2~2.5 times the load power. Inductive load: current is selected according to 3-7 times load current, voltage is selected according to 2.5-3 times load voltage.

According to the relationship between load current and ambient temperature, when the ambient temperature is high or heat dissipation conditions are not good, the current capacity of the solid state relay should be increased accordingly.
In order to prevent the product from short-circuiting during use, it is necessary to connect a fast circuit breaker or a fast fuse in series with the product in the load circuit.

For inductive loads, a freewheeling diode must be connected to both ends of the load, and a varistor must be connected to the output end (the varistor (MOV) is selected according to 1~1.5 times of the power supply voltage) to prevent the high voltage generated during switching from damaging the solid-state switch.

When the product is installed, it is required that the contact surface between the heatsink and the product must be flat and clean, and a layer of thermally conductive silicone grease is applied to its surface, and then finally the screws set with flat washers and Spring washersare tightened symmetrically to fix.