6 mm-wide I/O relay with lockable test switch
The Omron G2RV-SL700 DC24 (DC21) is a 6 mm-wide I/O relay that packs a lockable test switch into a slim DIN-rail footprint — a design choice that saves panel width without sacrificing the ability to manually force the output during commissioning or troubleshooting. Its 24 VDC coil and SPDT contact arrangement are standard for PLC output isolation and signal interposing, but the 6 A resistive rating at 250 VAC (1,500 VA) means it also handles moderate motor starter coil loads or solenoid valves directly, provided the inrush stays within the inductive rating of 2.5 A at 250 VAC (500 VA).
Switching limits and minimum load
The 6 A resistive rating at 250 VAC and 30 VDC defines the continuous current ceiling — above that the contact temperature rise accelerates and the mechanical life shortens. For inductive loads (contactors, small motors), the rating drops to 2.5 A at 250 VAC and 2 A at 30 VDC, reflecting the arc energy from the collapsing field. The minimum load specification of 10 mA at 5 VDC is the floor for reliable wetting — below that, oxide films on the silver-alloy contacts may not break down, causing intermittent opens in low-energy circuits like PLC dry-contact inputs. Maximum switching voltage of 400 VAC and 125 VDC sets the dielectric withstand boundary; the relay is not rated for 480 V line-to-line circuits.
Temperature envelope and panel placement
Rated for -40 to 55°C ambient, the G2RV-SL700 DC24 (DC21) can sit in an unheated enclosure or near a warm backplane, but the 55°C ceiling means derating applies if the relay is ganged in a high-density row — the self-heating from multiple coils operating simultaneously can push the internal temperature above the limit. The screw terminal simplifies field wiring with ferrule or ring terminals, common in panel builds where quick replacement without special tools is valued.