Siemens 3VA1150-6EF36-0CC0 — 50 A SENTRON MCCB for Line Protection
Breaking capacity is the headline here: 220 kA at 240 VAC, 154 kA at 415 V, 121 kA at 440 V, and still 17 kA at 690 V. That 220 kA figure at 240 V means this breaker can safely interrupt very high fault currents typical on the secondary side of large distribution transformers — critical for selective coordination in a plant main or sub-main distribution board. The high interrupting rating at 415 V (154 kA) also suits it for industrial 400 V class systems where fault levels can exceed 100 kA near the service entrance. Physical footprint: 130 mm height, 76.2 mm width, 70 mm depth. The 70 mm depth is a standard SENTRON 3VA dimension, meaning it fits existing panel layouts and busbar systems designed for this series without mechanical interference. Maximum power loss is 17.1 W, which is moderate for a 50 A frame — factor that into enclosure thermal rise calculations if the panel is densely packed.
Auxiliary Functions and Integration
This MCCB ships with an undervoltage release (UVR) and two auxiliary switches HQ (high-qualified) factory-installed. The UVR ensures the breaker trips if control voltage drops below a threshold — standard for safety circuits where loss of control power must open the main feeder. The two auxiliary switches provide status feedback (open/closed/tripped) to a PLC or indication panel, eliminating the need for add-on blocks in most applications. No communication function or ground-fault monitoring is included on this variant — it is a straight line-protection breaker with undervoltage release. If remote trip indication or ground-fault protection is required, a different 3VA variant or external add-on modules would be needed. The design is line protection, not motor protection — no thermal-motor curve or phase-loss sensitivity built in.