Omron G3NB-210B-1 — 10 A SSR, 24-220 VAC, DC 5-24 V
SKU: G3NB-210B-1USD 5.50
G3NB compact SSR, 10 A at 40 °C, AC 24-220 V load, DC 5-24 V control, zero-cross trigger, DIN-rail or panel mount.
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Product Overview
The Omron G3NB-210B-1 is a 10 A single-phase solid state relay from the G3NB family. The "B" in the suffix means zero-cross triggering — the relay closes at the next zero-voltage crossing of the AC load after the control input is energised, instead of at an arbitrary phase angle. Zero-cross switching keeps the inrush low on resistive loads (heaters, lamps) and cuts the EMI spike that random-fire SSRs leave on the AC line. A built-in varistor absorbs the back-EMF when an inductive load (solenoid, transformer) is de-energised.
Where the G3NB-210B-1 fits in the family
The G3NB-205B-1 is the same relay at 5 A, the -220B-1 jumps to 20 A, the -225B-1 to 25 A, and the -240B-1 to 40 A — all keep the same 24-220 V load range, the same DC 5-24 V control, and the same DIN-rail or screw mount. The -275B-1 (75 A) and -290B-1 (90 A) need external heat sinks for full current. The -1 suffix means zero-cross with varistor and DIN-rail mount; the -2 suffix typically widens the load voltage range and changes mounting — pick the -1 if 24-220 V covers the load. For a pre-built heatsink and integrated fan option at 25 A or 40 A, the G3NA family with a -UTU suffix adds heat-sink tabs.
Heat is the limiting factor on every SSR
The 10 A rating is at 40 °C ambient with the relay mounted on an aluminium plate or on the next relay in a tightly packed row. Above 40 °C, derate the load current using the Load Current vs. Ambient Temperature curve in the datasheet — at 60 °C the relay typically carries around 6 A instead of 10. Mount with the vent slots vertical, leave 10 mm clearance above and below, and add a thermal pad if the cabinet sits in a warm enclosure.
Before ordering
Confirm the load is single-phase AC at 24-220 V — for 200-480 V single-phase, the G3NA-410B or the G3PE-525B cover the higher voltage. Confirm the control signal is 5 VDC, 12 VDC, or 24 VDC (the relay's input accepts anything in the 5-24 V range). Order one more G3NB-210B-1 as a spare per cabinet — SSRs fail open or short less often than contactors, but a hot swap on a downed heater takes minutes when the spare is on the shelf.
Key Features
- G3NB compact single-phase solid state relay
- 10 A load current at 40 °C ambient (derated above 40 °C per the Load Current vs. Ambient Temperature curve)
- AC 24-220 V load voltage
- DC 5-24 V control input
- Zero-cross trigger (B suffix) for reduced EMI on resistive loads
- Built-in varistor absorbs back-EMF from inductive loads
- Photocoupler isolation between input and output
- Yellow LED indicates input ON
- DIN rail (TR35-15Fe per IEC 60715) or panel screw mount
- Approx. 60 g, 25 × 90 × 78 mm housing
- SKU: G3NB-210B-1
- Series: G3NB compact single-phase solid state relay
- Voltage: 24-220 V
- I/O: 5 I/O
Best-Fit Applications
- Heater-band switching on plastic-extrusion lines and injection-mould hot runners
- Heat-seal bar control on packaging machines running 24 VAC heaters
- Temperature-controlled oven or incubator where a contactor would wear out cyclically
- Solenoid or transformer switching where zero-cross keeps the inrush low
- Replacement for a mechanical relay in a high-cycle cabinet where contact wear would be a problem
Buying Checklist
- Pick G3NB-210B-1 for a 10 A zero-cross SSR at 24-220 VAC — pick G3NB-220B-1 (20 A) or G3NB-240B-1 (40 A) for higher current.
- Pick G3NA-440B-UTU instead for a 200-480 VAC load or when a heatsink is already integrated on the SSR.
- Pick G3PE-515B for a three-phase load (each phase carrying up to 15 A), not a G3NB — the G3NB is single-phase only.
- Derate above 40 °C ambient — at 60 °C the relay carries about 60 % of the rated current per the derating curve.
- Order one spare per cabinet — SSRs rarely fail, but a five-minute swap beats a 24-hour wait for a courier.
Technical Specifications
| Model | G3NB-210B-1 |
|---|---|
| Series | G3NB compact single-phase solid state relay |
| Load Voltage Range | AC 24-220 V (single phase) |
| Rated Load Current | 10 A at 40 °C ambient (derated above 40 °C) |
| Control Input | DC 5-24 V |
| Switching Method | Zero-cross trigger (B suffix) |
| Surge Protection | Built-in varistor absorbs inductive kickback |
| Isolation | Photocoupler between input and output |
| Indicator | Yellow LED — ON when input is energised |
| Mounting | DIN rail (TR35-15Fe / IEC 60715) or panel screw (M4) |
| Operating Temperature | -30 to +80 °C (no icing); derate load current above 40 °C |
| Approvals | UL, CSA, TÜV (EN) |
Resources & Downloads
FAQ for G3NB-210B-1
What is the difference between G3NB-210B-1 and G3NB-220B-1?
The G3NB-210B-1 is rated 10 A at 40 °C; the G3NB-220B-1 is rated 20 A at 40 °C. Both share the same AC 24-220 V load range, the same DC 5-24 V control, and the same zero-cross trigger. The 210B-1 fits a single heater band or a small oven; the 220B-1 covers a larger heating element or a modest 3 kW resistive load. Above 20 A, step up to the G3NB-225B-1 (25 A) or G3NB-240B-1 (40 A).
Does the G3NB-210B-1 need an external heat sink?
Not at 10 A in a 25 °C cabinet — the relay's built-in tab is enough. Above 40 °C, or when the cabinet sits next to a VFD or PSU, mount the relay on an aluminium plate or rail and derate the load current. At 60 °C the relay typically carries about 6 A instead of 10. Skipping the derating is the most common cause of G3NB failure in the field — the triac overheats and fails short across the load.
Can the G3NB-210B-1 switch a DC load?
No. The G3NB family is built around a triac output and is designed for AC loads only. The triac cannot turn off against a DC voltage, so a DC load through a G3NB will stay latched on indefinitely once energised. For DC load switching, use the G3NA-D210B-UTU DC SSR (DC 4-48 V load, 10 A) or the G3F / G3R I/O SSRs in DIN-rail housings.
What does the "B" in G3NB-210B-1 mean?
Zero-cross trigger. The relay closes at the next zero-voltage crossing of the AC line after the control input is turned on. This cuts the inrush on resistive loads (heaters, lamps) and reduces the EMI spike on the AC line. The alternative — random-fire — closes at the next phase-angle crossing and is used where fast turn-on matters more than EMI. For most heater and lighting applications, zero-cross is the safer default.
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