630 A MCCB with undervoltage release — panel integration note
The Siemens SENTRON 3VA1463-5EF32-0DF0 is a 3-pole molded case circuit breaker rated for 630 A continuous current, configured for line protection with a TM240 thermal-magnetic overcurrent release. It ships with an integrated undervoltage release (UVR) and a 1-form-C auxiliary switch plus trip alarm contact. The interrupting capacity reaches 187 kA at 240 V, 121 kA at 415 V, 76 kA at 500 V, and 11.9 kA at 690 V — figures that govern selectivity coordination upstream. Panel footprint is 248 mm high, 138 mm wide, 110 mm deep; the 192.9 W maximum power loss at full load matters for enclosure thermal calculations.
Current rating and thermal derating
Rated continuous current Iu is 630 A, and the breaker holds that rating from 40 °C through 50 °C ambient. Above 55 °C it derates linearly: 618 A at 55 °C, 607 A at 60 °C, 595 A at 65 °C, and 583 A at 70 °C. The operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. For a panel designer, the 630 A frame means this breaker covers main feeder or large motor branch applications where the load current stays under the trip threshold of the TM240 unit.
Interrupting capacity and selectivity
The interrupting ratings span the common industrial voltage levels. At 240 V the breaker clears 187 kA symmetrical; at 415 V it handles 121 kA; at 500 V it manages 76 kA; at 690 V it interrupts 11.9 kA. These are the values a site electrical engineer uses to verify SCCR compliance per IEC 60947-2 and to coordinate with downstream breakers. The 187 kA at 240 V is notably high for a 630 A frame — it supports installations with high fault current availability, such as large transformer secondaries or generator paralleling switchgear.
Auxiliary and undervoltage release configuration
The integrated undervoltage release (UVR) trips the breaker when control voltage drops below a set threshold — standard for safety circuits that require the breaker to open on loss of control power. The auxiliary contact block provides one normally-open/normally-closed auxiliary switch plus one dedicated trip alarm switch, both rated for the breaker's control voltage. This eliminates the need for a separate shunt trip in most undervoltage protection schemes. The UVR is factory-installed and wired to the breaker's internal terminals.