Omron G3NB-225B-1 — Solid State Relay, 25 A
SKU: G3NB-225B-1USD 8.00
G3NB solid state relay, 25 A load at AC24-220 V, DC5-24 V input, zero-cross switching, built-in varistor.
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Product Overview
The Omron G3NB-225B-1 is a solid state relay in the G3NB family, rated for 25 A continuous load current at AC24-220 V when mounted on a Y92B-N150 heat sink at 40 °C ambient. It is manufactured by Omron Corporation. Hengyixin Automation stocks this solid-state relay in Xiamen and ships within 3-5 business days to most Asian, European, and North American ports.
AC24-220 V load, zero-cross switching DC5-24 V control input (low-side trigger)
AC24-220 V load, zero-cross switching DC5-24 V control input (low-side trigger) AC24-220 V load, zero-cross switching DC5-24 V control input (low-side trigger)
Add a fast-blow fuse on the load side for short-circuit protection of the SSR output.
Key Features
- AC24-220 V load, zero-cross switching
- DC5-24 V control input (low-side trigger)
- Photocoupler isolation, 2500 V AC dielectric
- G3NB solid state relay, 25 A continuous load at 40 °C
- SKU: G3NB-225B-1
- Series: G3NB solid state relay
- Voltage: 220 V
Best-Fit Applications
- Resistive furnace or oven element control on a process line
- Solder pot or reflow oven element switching in electronic assembly
- Heat-seal jaw temperature control on packaging machinery lines
Buying Checklist
- Choose G3NB-225B-1 for 25 A zero-cross at DC5-24 V input.
- Choose G3NB-240B-1 when the load needs 40 A continuous.
- Choose G3NB-D210B for random turn-on switching of inductive loads.
Technical Specifications
| Series | G3NB solid state relay |
|---|---|
| Load Voltage | AC24-220 V (47-63 Hz) |
| Load Current | 25 A continuous at 40 °C with Y92B-N150 heat sink |
| Control Input | DC5-24 V (operate 4-32 V, release 1 V max.) |
| Input Current | 7 mA max. at 24 VDC |
| Switching Mode | Zero-cross (B suffix) |
| Surge Protection | Built-in varistor |
| Output Device | Triac |
| Isolation | Photocoupler, 2500 V AC dielectric |
| Operation Indicator | LED (lit when input is on) |
| Heat Sink | Y92B-N150 (required for 25 A rating) |
| Certifications | UL, CSA, TUV |
FAQ for G3NB-225B-1
What heat sink do I need for the G3NB-225B-1?
For the full 25 A rating at 40 °C ambient, fit the Y92B-N150 heat sink. The smaller Y92B-N100 covers up to 20 A, and the Y92B-N50 covers up to 10 A. Surface-mounting without a heat sink drops the rating by 30 %. Add the R99-12 one-touch mounting plate for DIN-rail installation of the SSR and heat sink.
Can the G3NB-225B-1 switch a transformer or motor?
It can, but zero-cross switching is the wrong pick for inductive loads. For transformers, solenoids, or small motors, choose the G3NB-D210B random turn-on SSR or use a contactor instead. For purely resistive loads like heaters or lamps, the zero-cross G3NB-225B-1 is the correct pick.
What fuse should I use on the load side?
Fit a fast-blow semiconductor fuse rated at about 1.5 x the load current. A 25 A SSR typically pairs with a 40 A fast-blow fuse. The fuse protects the SSR triac from a load-side short circuit, which the SSR itself cannot clear.
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