400V AC Molded Case Circuit Breaker

The SYM1-400V AC Molded Case Circuit Breaker manufacturer Zhejiang Soutya New Energy LLC, is a 400 V AC, 125-250 A thermal-magnetic circuit breaker featuring adjustable trip settings and an 85 kA rated ultimate short-circuit breaking capacity (50 kA rated service breaking capacity). With a double-break contact system and positive isolation, it is designed for reliable circuit protection in commercial switchboards, solar AC combiner boxes, and motor feeder circuits.

Technical Parameter

Application scenarios

Key Application Scenarios for SYM1-AC MCCB

1. Commercial & Industrial Power Panels

Main incomer or outgoing feeder breaker in 400 V, 125-250 A floor-standing or wall-mounted distribution boards, delivering short-circuit, overload and isolation protection.

2. PV AC Combiner Boxes

Installed on the AC output side of string inverters to collect and safeguard 380 V / 400 V grid-tie circuits, meeting the 85 kA ultimate short-circuit breaking capacity required by large rooftop or ground-mounted plants.

3. Inverter / UPS Grid-Front Ends

Protects the AC output of solar inverters, UPS or battery-energy-storage PCS, providing reliable fault clearance and visible isolation during maintenance.

4. Motor Feeder Circuits

Short-circuit, overload and phase-loss protection for 5.5-110 kW three-phase motors; integrates with contactors & thermal relays to form compact motor-control-centre (MCC) buckets.

5. Data-Centre & Precision-Air-Con Distribution

Feeds server rack PDUs, precision cooling units and UPS static-bypass circuits where high selectivity and 50 kA service breaking capacity are mandatory.

6. Rail & Infrastructure Substations

Used in stations, tunnels and signalling 400 V switchboards, offering 85 kA ultimate breaking under high prospective fault currents and vibration-prone environments.

7. Commercial Buildings & Hospitals

Sub-main or final distribution breaker in shopping malls, office towers and medical facilities, ensuring fast fault disconnection and continuity of critical loads.

8. Package Substations & Compact RMU

Replaces traditional HRC fuses in outdoor kiosk substations and small ring-main units, giving maintenance-free, re-usable short-circuit protection with positive isolation.