Federal Electric S400 3P 400A MCCB 37-SDMS-02

FEDERAL ELECTRIC S400 3 POLE 400 AMPS CIRCUIT BREAKER (37-SDMS-02)

The Federal Electric S400 is an industrial-grade, 3-pole molded case circuit breaker (MCCB) engineered for primary and secondary power distribution, motor control centers (MCC), marine switchboards, and utility-grade low-voltage substation panels. Manufactured to comply with stringent utility requirements—including Saudi Electricity Company SEC Specification 37-SDMS-02 (read in conjunction with 37-SDMS-01 and IEC/EN 60947-2)—the S400 frame provides short-circuit interruption and overload protection in high-ambient environments rated up to 55°C without de-rating.

Model Details

• Manufacturer: Federal Electric
• Model / Frame Series: S400 (Type S)
• Manufacturer Part Number (MPN): S400-3P-400A-37SDMS02
• SEC Item / Catalog Number: 08372001 / 37-SDMS-02
• Specification Revision: SEC 37-SDMS-01 / 37-SDMS-02 Rev 03

Key Features

1. Utility & Tropicalized Thermal Performance: Factory-calibrated for full nominal capacity operation at an elevated 55°C continuous ambient temperature, preventing false nuisance trips common in unventilated switchgear rooms and marine engine casings.
2. Industrial Utility Direct-Lug Accommodation: Specifically engineered outgoing connection geometry accepts standard M10 bolts with 30mm palm widths for direct integration of heavy 300 mm² conductors without requiring outboard terminal spreaders.
3. True Trip-Free Safety Mechanism: Internal mechanical toggle linkage cannot be held closed manually against an existing short-circuit or sustained thermal over-current fault condition.
4. Phase Isolation Security: Supplied standard with high-dielectric inter-phase barrier shields and terminal covers, preventing flashover ionization during severe arc interruption.

Applications

• Marine & Offshore Power Systems: Main low-voltage switchboards (400V/440V 60Hz), emergency generator distribution panels, thruster motor feeder circuits, and reefer container feed banks.
• Substation LV Distribution: Outgoing feeder protection on SEC low-voltage package substations and distribution transformers (conforming to SEC 37-SDMS-02).
• Industrial Motor Control Centers (MCC): Heavy motor feeder protection for chiller compressors, centrifugal slurry pumps, hydraulic power units, and ball mills.
• Commercial & Infrastructure Facilities: Main switchboards (MSB), sub-distribution boards (SDB), uninterruptible power supply (UPS) bypass circuits, and HVAC central plant boards.
• Generator & Transfer Systems: Standby diesel generator breaker outputs and automatic/manual transfer switchboard (ATS/MTS) main disconnects.

Part Number Cross-References

• Federal Electric: S400 / S400-3P-400A / Item No: 08372001
• SEC Distribution Standard: 37-SDMS-02 (400A MCCB Specification)
• Alternative Cross-Reference Equivalents: CHINT NXMG-400/3300 (SEC 37-SDMS-02), Schneider EasyPact CVS400F 3P, ABB Formula A3N 400 3P

Frequently Asked Questions

Can the Federal Electric S400 trip current be adjusted in the field?

No. In strict accordance with utility standard SEC 37-SDMS-02, the S400 features a fixed 400A thermal-magnetic trip unit to prevent unauthorized field adjustments in distribution networks.

Is this breaker suitable for both 50 Hz and 60 Hz electrical systems?

Yes. The arc-quenching chambers, contacts, and magnetic release assemblies are fully rated and tested for dual-frequency 50 Hz and 60 Hz operations up to 690V AC.

What is the maximum cable size that connects directly to the outgoing lugs?

The outgoing terminal geometry accommodates standard bimetallic or copper compression lugs for cable cross-sections up to 300 mm² with an M10 bolt and 30mm palm width without requiring terminal spreaders.

Can the S400 be mounted horizontally on a switchboard backplate?

Yes. The internal spring toggle mechanism operates independently of gravity, allowing standard vertical, horizontal (left/right rotated 90°), or panel-flush configurations without de-rating interrupting capacity.