
OMRON
Same Omron G5NB 1A family but with a 12V coil, so it needs coil-drive review.
G5NB-1A-E-24VDC is a 24V, 4-pin, SPST-NO Omron PCB relay. Current candidates need FAE review before use.
coil voltage/current must match driver
pinout evidence is incomplete
relay has no protocol
all kept items are catalog indexed
No pin-compatible replacement is confirmed from the provided fields.
Prefer a verified 24V G5NB-1A-E variant; listed alternatives need pinout and coil checks.
Pinout and coil-drive compatibility are not proven.

OMRON
Same Omron G5NB 1A family but with a 12V coil, so it needs coil-drive review.
| Feature / factor | G5NB-1A-E-24VDC | G5NB-1A-E DC12 | G4A-1A-PE DC24 | YQ501-S-124D | Compatibility / risk |
|---|---|---|---|---|---|
| Voltage | 24V coil | 12V coil | 24V coil | 24V coil | 12V coil / 24V coil — cannot use on 24V coil rail; G4A-1A-PE DC24: coil voltage aligns; YQ501-S-124D: coil voltage aligns |
| Interface | SPST-NO | SPST-NO | SPST-NO | SPDT | SPST-NO / SPDT — same contact form; G4A-1A-PE DC24: same contact form; YQ501-S-124D: extra NC contact |
| Current | 5A | 5A at 250VAC | 20A | 20A | 5A at 250VAC / 20A — load rating aligns; G4A-1A-PE DC24: contact rating higher; YQ501-S-124D: higher switching current |
| Package | PCB Mount | PCB Mount | - | PCB/Plugin | PCB Mount / PCB/Plugin — mount type only; YQ501-S-124D: mount data conflicts |
| Pinout | 4 pins | 4 pins | missing | 5 pins/unknown | 4 pins / missing / 5 pins/unknown — pin functions not shown; G4A-1A-PE DC24: no pin evidence; YQ501-S-124D: not pin-compatible |
| Resistance | 2880Ω coil | - | 640Ω coil | - | 640Ω coil — more coil current |
From the provided list, none is a confirmed direct replacement. A verified 24V G5NB-1A-E part would be preferred.