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Siemens 5SY63257 - MCB 63A 1-Pole 277/480V AC

Siemens
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The Siemens 5SY63257 is a miniature circuit breaker designed for overcurrent and short-circuit protection in industrial control panels and distribution systems. It is rated for 63A at 277/480V AC, with a high breaking capacity suitable for branch circuit protection. This single-pole unit features a compact 1-module width (17.5mm) for DIN rail mounting, with a thermal-magnetic trip mechanism and screw-type terminals for secure wiring. It complies with IEC 60898 and UL 1077 standards, ensuring reliable performance in commercial and light industrial environments. Typical applications include motor control centers, lighting panels, and machinery disconnects where space-saving and dependable circuit isolation are required.

Key Features & Specifications
  • Type: Miniature Circuit Breaker (MCB), thermal-magnetic, DIN rail mount
  • Voltage Rating: 277/480V AC
  • Current Rating: 63A
  • Dimensions: 17.5mm width (1 module), 88mm height, 69mm depth
  • Standards: IEC 60898, UL 1077
  • Applications: Industrial control panels, lighting distribution, motor protection
  • Switch Type: Toggle
  • Configuration: Single-pole
  • Coil Voltage Maximum: Not applicable (thermal-magnetic)
  • Temp Rating: -25°C to 55°C
  • Shipping Dimensions: 3.5 x 2.5 x 1.5 inches
  • Phase: Single-phase
  • Voltage: 277/480V AC
  • Amperage: 63A
  • AIC rating: 10kA at 480V AC
  • Connection: Screw terminals
  • Poles: 1
  • Protection: Overcurrent and short-circuit
  • Functions: Circuit isolation and protection
  • Frame Size: 1-module
  • Trip Type: Thermal-magnetic
  • Panel Type: DIN rail
  • Breaker Type: Miniature
  • Control Voltage Minimum: Not applicable
  • Control Voltage Maximum: Not applicable
  • MCM Size: Not applicable
  • Metal Type: Copper alloy terminals
  • Panel Style: Modular
  • Bus Type: Not applicable
  • Fuse Class: Not applicable
  • Insulation Temperature: 105°C
  • Inductance: Not applicable
  • Impedance: Not applicable
  • Barrels: Not applicable
  • Class Rating: Not applicable
  • Diameter: Not applicable
  • Velocity: Not applicable
  • Clip Center: Not applicable
  • Clas: Not applicable
  • Mounting: DIN rail
  • Hz: 50/60 Hz
  • Coil Material: Not applicable
  • Horse Power: Not applicable
  • Aux Contacts: Not included
  • CPT: Not applicable
  • Full Load Amps: 63A
  • Dist Voltage: Not applicable
  • Bucket Size: Not applicable
  • Bucket Style: Not applicable
  • Bucket Type: Not applicable
  • Full Load Amp Maximum: 63A
  • Full Load Amp Minimum: Not applicable
  • Enclosure: Open style
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: 14 AWG to 4 AWG
  • Amperage Maximum: 63A
  • Amperage Minimum: Not applicable
  • Nema Rating: 1 (indoor)
  • Switch Style: Toggle
  • Wire Size: 14 AWG to 4 AWG
  • Certification: UL, CE, IEC
  • Circuit Breaker Mounting Style: DIN rail
  • Terminal Connection: Screw
  • Frequency Rating: 50/60 Hz
  • Phase Connection: Single-phase
  • Standards: IEC 60898, UL 1077
  • Compatible Frames: Not applicable
  • Installation Type: Fixed
  • Item QTY: 1
  • Nema Starter Size: Not applicable
  • Breaker Frame: 1-module
  • Current Rating: 63A
  • Reverse Standoff Voltage: Not applicable
  • Watts: Not applicable
  • Peak Pulse Current: Not applicable
  • Breakdown Voltage (MIN VBR@IT ) (V): Not applicable
  • Breakdown Voltage (VBR@IT) (V): Not applicable
  • Polarity: Not applicable
  • Operating Temperature Maximum Celsius: 55°C
  • Max Clamp Voltage: Not applicable
  • On-State Current: Not applicable


Product Identification
  • UPC: 75455493117
  • GTIN: 00754554931173