Thermal overload relay for motor protection circuits
Rated for a gG fuse coordination of 125 A (type of assignment 2) and 200 A (type of coordination 1), this relay integrates into a selective coordination scheme: the 125 A limit ensures the upstream fuse clears before the relay is damaged under a short circuit, preserving the downstream motor branch.
For compliance documentation, the part carries a substance prohibition date of July 1, 2006, aligning with the original EU RoHS directive. The ATEX approval (DMT 98 ATEX G 001) confirms suitability for explosive gas atmospheres — a documented certification that supports the validation engineer's requirement for traceable hazardous-area compliance.
Integration and mounting flexibility
Mounting position is specified with a vertical mounting surface, rotatable ±135° and tiltable ±45° to front and back — enough range to fit into tight enclosure layouts or angled backplanes. Clearance requirements are tight: 0 mm upwards, forwards, backwards, and downwards, with only 6 mm needed at the side. That zero-clearance stack allows the relay to be installed directly against adjacent components or enclosure walls without derating. Dimensions are 120 mm high, 70 mm wide, and 140 mm deep — a compact S3 footprint that fits standard DIN-rail or screw-mount panels without requiring oversized gland plates. Relative humidity during operation is 100 %, so condensation-prone environments (washdown zones, cold rooms) are within specification as long as the IP20 front is inside a sealed enclosure.
Electrical ratings and surge withstand
Shock resistance is tested at 8g for 10 ms, covering most vibration environments short of direct hammer-drill mounting. Auxiliary contact ratings are specified at multiple control voltages: 1 A at 24 V, 3 A at 120 V, 2 A at 230 V, and 1 A at 400 V — covering both low-voltage DC and standard AC control circuits. The 0.22 A at 110 V and 125 V, and 0.11 A at 220 V, provide additional granularity for legacy control voltages. Power dissipation per pole is 5.7 W. For a three-pole relay, total heat load is approximately 17.1 W — a figure the panel designer must include in the enclosure thermal budget to avoid cumulative derating.