It carries a TM220 thermal-magnetic release — the thermal element handles overloads, the magnetic element clears short circuits — and delivers a breaking capacity of 220 kA at 240 V AC, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 500 V and 690 V.
At 415 V the breaker still clears 154 kA, which covers most industrial distribution transformers. The 25 A continuous rating holds flat from 40 °C to 50 °C, then derates to 24 A at 55–60 °C and 23 A at 65–70 °C — useful to know if the breaker sits in a warm cabinet. The 4-pole design (3 phases + neutral switched) suits TN-S or TN-C-S systems where the neutral needs disconnection. Dimensions are 130 mm high, 101.6 mm wide, 70 mm deep — a standard SENTRON 3VA footprint that fits existing panel cutouts and busbar arrangements.
Thermal management and environment
Maximum power loss is 8.5 W — negligible for most enclosures but worth factoring into a sealed cabinet heat budget.