Description
Technical Specifications
- Product Model: FD63T250
- Brand: Siemens Sentron
- Warranty: One Year
- Input Voltage: Max 600 VAC / 500 VDC, 50/60 Hz
- Operating Temperature: 0 °C to +40 °C
- Storage Temperature: -40 °C to +85 °C
- Response Time: Inverse time thermal trip; instantaneous magnetic trip < 20 ms
- Protection Class: IP20 (cabinet mounting)
- Accuracy Class: ±10% thermal trip tolerance
- Output Frequency: 50 / 60 Hz
- Rated Current Range: 250 A continuous; magnetic adjustable 1100 A – 2500 A
- Communication Interface: N/A
- Supported Protocols: N/A
- Overload Capacity: 22 kA interrupt rating at 600 VAC
- Dimensions: 114 mm × 127 mm × 102 mm
Product Overview
The Siemens FD63T250 is an interchangeable 3-pole thermal-magnetic trip unit built exclusively for FD6 series molded case circuit breaker frames. This assembly delivers dual overcurrent protection: inverse time thermal protection for sustained overload conditions and adjustable instantaneous magnetic protection for short-circuit faults. Installed directly inside FD6 MCCB housings, it continuously monitors three-phase load current and initiates mechanical tripping to isolate faulty circuits before damage occurs to cables, motors, transformers and downstream control equipment. The adjustable magnetic threshold enables tailored coordination with upstream and downstream protective devices. Electrical engineers and maintenance crews utilise this trip unit for breaker repairs, system upgrades or selective protection tuning. Modular interchangeability eliminates full breaker replacement, cuts maintenance expenditure and shortens downtime during scheduled industrial outages.
Application Scenarios
- Industrial Medium Voltage Auxiliary Switchgear: Equipped inside FD6 circuit breakers to protect three-phase distribution feeders for factory motor control centres. Adjustable magnetic settings support proper protective coordination to contain short-circuit faults within individual branch circuits.
- Petrochemical Plant Process Power Panels: Safeguards critical pump, compressor and fan power circuits. Robust thermal-magnetic performance delivers stable overload detection amid fluctuating process loads in electrically noisy industrial environments.
- Commercial & Institutional Main Distribution Boards: Used for primary and secondary power distribution protection in large facilities. Standardised trip architecture simplifies spare parts management across multi-building campus electrical networks.
- Water Treatment Pumping Stations: Provides circuit protection for large three-phase submersible pumps and aeration equipment. Inverse time thermal characteristics safely handle pump startup inrush currents without unwanted nuisance tripping.
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