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Siemens NFK3T250 - Fusible Safety Switch 250A 600V

Siemens
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The Siemens NFK3T250 is a 250A, 3-pole, 600V AC/250V DC heavy-duty fusible safety switch designed for reliable circuit disconnection and overcurrent protection in industrial power distribution systems. It features a NEMA 3R rainproof enclosure constructed from galvanized steel, suitable for outdoor installation, and utilizes Class R fuse clips for high fault current interruption up to 200kA RMS symmetrical. This switch complies with UL 98 and CSA C22.2 No. 4 standards, ensuring robust performance in motor control centers, feeder disconnects, and service entrance applications where high short-circuit current ratings are required. Weighing 5.19 lb, it is typically deployed in manufacturing plants, commercial buildings, and utility substations for isolating electrical equipment during maintenance or emergency shutdowns.

Key Features & Specifications
  • Type: Heavy-duty fusible safety switch, NEMA 3R rainproof enclosure, galvanized steel construction
  • Voltage Rating: 600V AC / 250V DC
  • Current Rating: 250A
  • Dimensions: Not specified
  • Standards: UL 98, CSA C22.2 No. 4
  • Applications: Industrial power distribution, motor control centers, feeder disconnects, service entrance
  • Switch Type: Fusible safety switch
  • Configuration: 3-pole, 3-wire
  • Coil Voltage Maximum: Not applicable (manual switch)
  • Temp Rating: Not specified
  • Shipping Dimensions: Not specified
  • Phase: 3-phase
  • Voltage: 600V AC / 250V DC
  • Amperage: 250A
  • AIC rating: 200kA RMS symmetrical (with Class R fuses)
  • Connection: Line and load lugs
  • Poles: 3
  • Protection: Overcurrent (fuse-dependent)
  • Functions: Disconnect, isolation
  • Frame Size: 250A
  • Trip Type: Not applicable (fuse-based)
  • Panel Type: Not specified
  • Breaker Type: Fusible switch
  • Control Voltage Minimum: Not applicable
  • Control Voltage Maximum: Not applicable
  • MCM Size: Not specified
  • Metal Type: Galvanized steel
  • Panel Style: NEMA 3R
  • Bus Type: Not specified
  • Fuse Class: R (Class R clips)
  • Insulation Temperature: Not specified
  • Inductance: Not applicable
  • Impedance: Not applicable
  • Barrels: Not applicable
  • Class Rating: Not specified
  • Diameter: Not applicable
  • Velocity: Not applicable
  • Clip Center: Not specified
  • Clas: Not specified
  • Mounting: Surface mount
  • Hz: 50/60 Hz
  • Coil Material: Not applicable
  • Horse Power: Not specified
  • Aux Contacts: Not specified
  • CPT: Not specified
  • Full Load Amps: Not specified
  • Dist Voltage: Not specified
  • Bucket Size: Not applicable
  • Bucket Style: Not applicable
  • Bucket Type: Not applicable
  • Full Load Amp Maximum: Not specified
  • Full Load Amp Minimum: Not specified
  • Enclosure: NEMA 3R rainproof
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: Not specified
  • Amperage Maximum: 250A
  • Amperage Minimum: Not specified
  • Nema Rating: 3R
  • Switch Style: Heavy-duty
  • Wire Size: Not specified
  • Certification: UL, CSA
  • Circuit Breaker Mounting Style: Not applicable (switch)
  • Terminal Connection: Line and load lugs
  • Frequency Rating: 50/60 Hz
  • Phase Connection: 3-wire
  • Standards: UL 98, CSA C22.2 No. 4
  • Compatible Frames: Not specified
  • Installation Type: Surface mount
  • Item QTY: 1
  • Nema Starter Size: Not applicable
  • Breaker Frame: Not applicable
  • Current Rating: 250A
  • Reverse Standoff Voltage: Not applicable
  • Watts: Not specified
  • 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: Not specified
  • Max Clamp Voltage: Not applicable
  • On-State Current: Not applicable


Product Identification
  • UPC: 88762113412
  • GTIN: 00887621134129