Omron Solid State Relays — G3NA & G3PE
G3NA and G3PE are solid state relays — panel-mount hockey-puck units that switch heaters, solenoids and other AC or DC loads with no mechanical contact. They need a heatsink; there is no socket and no relay base. Load current, load voltage class and AC or DC output are all encoded in the model number.
Lifecycle status
The -UTU line is current; earlier G3NA variants are end-of-life
Omron's discontinuation database records three waves of G3NA end-of-production: pre-2012 G3NA units ended 31 January 2012 with the RoHS -2 suffix as replacement, the -205B/-210B/-220B/-225B (C) variants ended 31 March 2014 in favour of the G3NB equivalents, and the -210B/-220B/-250B/-205B units without -UTU ended 31 March 2020. The -UTU certified line remains current and is what we stock.
What to fit instead: -UTU variants replace the pre-2020 non-UTU units
Key specifications
- G3NA is a solid state relay in panel-mount hockey-puck form with screw terminals — no socket exists
- G3NA-210B-UTU DC5-24V: AC output, 200 VAC class, 10 A at 24-240 VAC (19-264 V), zero-cross, TÜV certified, 5-24 VDC control input, 7 mA maximum control current
- The D in the model number is what makes it a DC-output SSR: G3NA-D210B-UTU is 10 A at 5-200 VDC on a photocoupler rather than a phototriac
- UTU means UL plus CSA plus TÜV certification, and the trailing -2 marks RoHS conformance
- G3PE is a DIN-rail-mount SSR for panel use where a hockey puck will not fit
- Load voltage class is the digit after the platform code: 2 is the 200 VAC class, 4 the 400 VAC class
How to read a G3NA model number
Four decisions in eight characters: AC or DC output, load voltage class, load current, and mounting/certification.
| Element | Meaning | Example |
|---|---|---|
| G3NA | Solid state relay, hockey-puck panel mount | G3PE is the DIN-rail alternative |
| blank / D | AC output (phototriac) / DC output (photocoupler) | G3NA-D210B is DC output |
| 2 / 4 | Load voltage class | 2 = 200 VAC, 4 = 400 VAC |
| 05 10 20 25 40 50 75 90 | Rated load current in amps | 210B = 200 VAC class, 10 A |
| B | Screw terminals | All G3NA variants we stock use B |
| UTU | UL + CSA + TUV certified | Distinguishes the current line |
| -2 | RoHS conforming | Pre-2012 units without it are end-of-life |
One conflict worth flagging rather than hiding: Omron's own G3NA legend decodes G3NA-450B as 400 VAC class / 50 A, while Omron's ordering table lists the same model as 75 A at 200-480 VAC. Confirm the rating on the unit's label against the datasheet before sizing a heatsink.
Where these parts get used
- Heater banks on an injection moulding machine where zero-cross switching avoids the RFI that a mechanical contactor produces
- Valve and solenoid control on a fast packaging cycle where the SSR switching speed matters more than contact life
- Retrofit of an older G3NA installation where the pre-2020 non-UTU units need replacing with the certified -UTU equivalents
Which model do you need
- Choose AC output for AC loads and the D variant for DC loads — they are different devices with different optocouplers.
- Size the heatsink from the load current and the duty cycle, not from the model number alone, and check the 450B conflict above.
- Choose G3PE instead of G3NA when the cabinet has DIN rail but no panel space for a hockey puck.
- Check whether the unit you are replacing is a pre-2020 non-UTU variant; those are end-of-life and the -UTU line is the successor.
All 9 Omron Solid State Relays SKUs
Every part number below links to its own page with full specifications, compatibility notes and stock status.
Frequently asked
Does a G3NA solid state relay need a socket?
No. G3NA units are panel-mounted with screw terminals, in the hockey-puck form factor, and mount directly to a heatsink such as the Y92B-N50. There is no relay base or socket in this family — if you have a relay socket in your panel, a G3NA is the wrong product.
What is the difference between G3NA-210B and G3NA-D210B?
Output type. The plain G3NA-210B switches AC loads through a phototriac. The G3NA-D210B switches DC loads through a photocoupler, rated 10 A at 5-200 VDC. Using an AC-output unit on a DC load is a common and expensive mistake.
What current is a G3NA-450B-UTU-2 rated at?
Omron's documentation conflicts with itself here, so confirm against the datasheet for your unit. The model-number legend decodes the 4 as the 400 VAC class and the 50 as 50 A, while Omron's ordering table lists the same model at 75 A over 200-480 VAC. We will confirm the figure against the unit in hand before you order.
Are older G3NA models still available?
The -UTU certified line is current. Earlier variants are not: pre-2012 units ended January 2012, the (C) versions ended March 2014 in favour of the G3NB equivalents, and the -210B/-220B/-250B/-205B units without -UTU ended March 2020.
Do I need a heatsink with a G3NA?
Yes. A solid state relay conducts heat from the load through its body, and without a heatsink it will fail well below its rated current. Size the heatsink for the load current and the duty cycle — at full rated current continuously these units need substantial heatsinking.
Specification sources
Specifications on this page were checked against Omron's own documentation. If a figure here disagrees with your datasheet, the datasheet wins — tell us and we will correct it.
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