SIEMENS
SIEMENS B350H Miniature Circuit Breaker BL Series 50A 3 Pole 240V AC 22kA
Three-pole miniature circuit breaker rated 50 A at 240 V AC with a 22 kA interrupting capacity for Siemens P1 panelboards
- Reliable three-phase protection with 22 kA interrupting capacity
- 50 A rating handles standard branch-circuit loads
- Bolt-on mounting fits Siemens P1 panelboards directly
- Terminal lugs accept 8 AWG to 4 AWG aluminium and 6 AWG copper
- 240 V AC rating suits common commercial and residential panels
Circuit Breaker for Three-Phase Panels
The SIEMENS B350H is a miniature circuit breaker from the BL series rated at 50 A for three-phase 240 V AC systems. It mounts by bolting onto compatible Siemens P1 panelboards and provides standard overcurrent protection with a 22 kA interrupting rating at 240 V AC. This device suits electricians and facility managers installing or maintaining three-pole branch circuits in commercial or light-industrial panels.
Thermal and Electrical Behaviour
The breaker carries a continuous 50 A load within a 125 A frame and trips on sustained overcurrent to protect downstream conductors. Its toggle actuator gives clear visual indication of the tripped state. The 22 kA AIR rating means it can safely interrupt high fault currents at 240 V AC without damage, limiting let-through energy during short-circuit events.
Bolt-On Mounting and Lug Terminals
Bolt-on mounting secures the breaker firmly to the panelboard bus, reducing the risk of loose connections under vibration or thermal cycling. The integral lug terminals accept copper conductors from 8 AWG to 6 AWG and aluminium conductors from 8 AWG to 4 AWG. The three-pole, 3-inch by 3-inch footprint fits standard P1 panelboard spaces, and the toggle is accessible for manual switching after the panel door is closed.
Highlights
- Reliable three-phase protection with 22 kA interrupting capacity
- 50 A rating handles standard branch-circuit loads
- Bolt-on mounting fits Siemens P1 panelboards directly
- Terminal lugs accept 8 AWG to 4 AWG aluminium and 6 AWG copper
- 240 V AC rating suits common commercial and residential panels
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
How do I bolt the B350H onto the panelboard rail and torque the lugs correctly?
Mount the breaker by bolting it directly to the Siemens P1 panelboard rail; then insert conductors between 8 AWG and 4 AWG aluminium or 6 AWG copper into the lug terminals and torque to the manufacturer's specified value.
Which parts of the B350H will need inspection or replacement after years of service?
The toggle actuator, bolt-on mounting hardware and lug terminals should be checked periodically for wear, corrosion or loose connections; the breaker itself is replaced only after a fault trip or if it fails to reset.
What is the maximum fault current the B350H can interrupt before it must be replaced?
The breaker is rated to interrupt up to 22 kA at 240 V AC; any fault exceeding that level would require a device with a higher AIR rating.
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