Line protection MCCB with high interrupting capacity
The Siemens SENTRON 3VA1032-4ED32-0AD0 is a 3-pole molded case circuit breaker rated for 32 A continuous current at 40 °C, using a TM210 thermal-magnetic overcurrent release. Its interrupting capacity reaches 121 kA at 240 V and 75.6 kA at 415 V, making it suitable for high-fault-current panelboards and distribution boards where a standard MCB would not hold. The 800 V rated insulation voltage (Ui) confirms it can be used in 480Y/277 V and 600 V delta systems with adequate clearance.
What the ratings mean for fit
The 32 A rating holds flat from 40 °C to 50 °C — no derating needed in a typical 40 °C panel ambient. Above 50 °C it drops to 30.72 A at 55 °C and 28.8 A at 70 °C, which matters if this breaker sits near heat sources or in a non-ventilated enclosure. The 121 kA at 240 V figure governs its use on the secondary side of a 208Y/120 V transformer or a 240 V delta service; at 480 V the available fault current must be below 75.6 kA, and at 600 V class (690 V rated) the limit is 11.9 kA. The TM210 release is fixed thermal and magnetic — no field-adjustable trip settings, so the breaker is selected for a specific load current, not tuned on site.
Panel integration and mechanical fit
At 76.2 mm wide, 130 mm tall, and 70 mm deep, this MCCB occupies a standard 3-pole footprint for the SENTRON 3VA platform. The IP40 front protection means it is suitable for enclosed panel mounting where tools or fingers cannot contact live parts. Three auxiliary switches (HQ type) are integrated for status feedback to a PLC or remote indication — no separate aux kit to order. The 15 000-cycle latching endurance (mechanical) suits applications with occasional switching, not daily load-break duty.