Omron Safety Relays — G7SA
G7SA relays carry forcibly guided contacts to EN/IEC 61810-3, which is what allows a safety contactor stack to be monitored rather than assumed. The guidance means the normally-closed contact cannot physically close if the normally-open contact has not closed first, so a welded contact is detectable. They are relays, not modules — P7SA sockets are separate.
Lifecycle status
In production — no end-of-life record
Omron carries G7SA with live product pages across Europe and Asia-Pacific and returns no discontinuation entry for the family in its China database. Sockets are the P7SA range and are ordered separately.
What to fit instead: None required
Key specifications
- Forcibly guided contacts to EN/IEC 61810-3 (VDE), so a welded NO contact is detectable through the NC contact
- G7SA-2A2B: 2 NO (DPST-NO) plus 2 NC (DPST-NC) = 4 poles, 14 terminals
- G7SA-3A1B: 3 NO plus 1 NC = 4 poles; G7SA-5A1B: 5 NO plus 1 NC = 6 poles
- Rated 6 A at 250 VAC and 6 A at 30 VDC resistive, maximum switching voltage 250 VAC / 125 VDC
- Timing: operating time 20 ms max, response time 10 ms max, release time 20 ms max
- Durability: 10,000,000 mechanical operations minimum, 100,000 electrical operations minimum
- Maximum switching frequency 36,000 operations per hour mechanical, 1,800 per hour at rated load
How to read a G7SA model number
The A and B counts are the NO and NC poles. Everything after is the coil.
| Element | Meaning | Example |
|---|---|---|
| 2A2B | 2 NO + 2 NC, four poles | G7SA-2A2B DC24 |
| 3A1B | 3 NO + 1 NC, four poles | G7SA-3A1B |
| 5A1B | 5 NO + 1 NC, six poles | G7SA-5A1B DC24V |
| DC24 / DC24V | Coil voltage | 24 VDC |
Coil figures differ between the four-pole and six-pole parts: G7SA-2A2B draws roughly 15 mA at 1,600 ohms, while the six-pole G7SA-5A1B is closer to 20.8 mA at 1,152 ohms. Size the safety circuit's supply for the pole count you actually fit.
Where these parts get used
- Monitoring a stack of safety contactors so a welded contact stops the machine rather than being assumed healthy
- Safety relay output stage driving contactors where the feedback loop proves the contacts actually opened
- Retrofit of older safety circuits where a plain interposing relay gives no contact-state feedback
Which model do you need
- Choose G7SA only where you need contact-state feedback — a standard interposing relay is cheaper and adequate if the circuit is not diagnostic.
- Match the pole count to the contactor stack: 2A2B and 3A1B are four-pole, 5A1B is six-pole.
- Order a P7SA socket separately — the relay does not include one.
- Account for 20 ms operating and release time when setting the safety circuit's timing.
All 4 Omron Safety Relays SKUs
Every part number below links to its own page with full specifications, compatibility notes and stock status.
Frequently asked
What does forcibly guided contact mean on a G7SA?
It is a mechanical interlock between the normally-open and normally-closed contact sets, certified to EN/IEC 61810-3. The NC contact cannot physically close unless the NO contacts have opened first. That means a welded NO contact is detectable through the NC contact, which is what lets a safety circuit prove the contactor stack actually de-energised instead of assuming it.
What is the difference between G7SA-2A2B and G7SA-5A1B?
Pole count. G7SA-2A2B has 2 normally-open plus 2 normally-closed contacts, four poles and 14 terminals. G7SA-5A1B has 5 normally-open plus 1 normally-closed, six poles. They also differ in coil consumption — the four-pole parts draw roughly 15 mA against about 20.8 mA for the six-pole.
Are G7SA relays a safety relay or a safety relay module?
They are relays with forcibly guided contacts, not modules. The P7SA range is the matching DIN-rail or PCB socket, and it is ordered separately — the G7SA does not come with a base.
How fast is a G7SA?
Operating time 20 ms maximum, response time 10 ms maximum, release time 20 ms maximum. Mechanical durability is 10,000,000 operations minimum and electrical durability 100,000 operations minimum, with a maximum switching frequency of 36,000 operations per hour mechanical or 1,800 per hour at rated load.
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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