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Siemens MMSKWN2 - Miniature Circuit Breaker 20A 1-Pole

Siemens
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The Siemens MMSKWN2 is a compact, high-performance miniature circuit breaker designed for overcurrent and short-circuit protection in industrial control panels and branch circuits. It is rated for 480Y/277 VAC operation with a current rating of 20 amperes and a 10 kAIC interrupting capacity, housed in a 1-pole, 1-inch wide molded case with a thermal-magnetic trip mechanism. The unit features a plug-in mounting style, screw-type terminal connections, and is constructed with a durable thermoplastic enclosure rated for 40°C ambient temperature. It complies with UL 489 and CSA C22.2 No. 5 standards, making it suitable for use in motor control centers, lighting panels, and distribution boards. Weighing 1.35 lb, this breaker is designed for 60 Hz systems and supports copper or aluminum wire sizes from 14 AWG to 8 AWG.

Key Features & Specifications
  • Type: Miniature Circuit Breaker, Thermal-Magnetic Trip, Molded Case
  • Voltage Rating: 480Y/277 VAC
  • Current Rating: 20 A
  • Dimensions: 1-inch width per pole
  • Standards: UL 489, CSA C22.2 No. 5
  • Applications: Industrial control panels, lighting panels, branch circuit protection
  • Switch Type: Toggle
  • Configuration: 1-Pole
  • Coil Voltage Maximum: N/A (thermal-magnetic)
  • Temp Rating: 40°C
  • Shipping Dimensions: Not specified
  • Phase: 1-Phase
  • Voltage: 480Y/277 VAC
  • Amperage: 20 A
  • AIC rating: 10 kAIC
  • Connection: Screw terminals
  • Poles: 1
  • Protection: Overcurrent and short-circuit
  • Functions: Circuit interruption
  • Frame Size: 1-inch
  • Trip Type: Thermal-Magnetic
  • Panel Type: Not specified
  • Breaker Type: Miniature
  • Control Voltage Minimum: N/A
  • Control Voltage Maximum: N/A
  • MCM Size: N/A
  • Metal Type: Not specified
  • Panel Style: Not specified
  • Bus Type: Not specified
  • Fuse Class: N/A
  • Insulation Temperature: Not specified
  • Inductance: N/A
  • Impedance: N/A
  • Barrels: N/A
  • Class Rating: Not specified
  • Diameter: N/A
  • Velocity: N/A
  • Clip Center: N/A
  • Clas: N/A
  • Mounting: Plug-in
  • Hz: 60 Hz
  • Coil Material: N/A
  • Horse Power: Not specified
  • Aux Contacts: Not specified
  • CPT: Not specified
  • Full Load Amps: Not specified
  • Dist Voltage: Not specified
  • Bucket Size: Not specified
  • Bucket Style: Not specified
  • Bucket Type: Not specified
  • Full Load Amp Maximum: Not specified
  • Full Load Amp Minimum: Not specified
  • Enclosure: Thermoplastic
  • Relay Style: N/A
  • Coil Voltage Minimum: N/A
  • Wire: Copper or Aluminum
  • Amperage Maximum: 20 A
  • Amperage Minimum: Not specified
  • Nema Rating: Not specified
  • Switch Style: Toggle
  • Wire Size: 14 AWG to 8 AWG
  • Certification: UL, CSA
  • Circuit Breaker Mounting Style: Plug-in
  • Terminal Connection: Screw
  • Frequency Rating: 60 Hz
  • Phase Connection: 1-Phase
  • Standards: UL 489, CSA C22.2 No. 5
  • Compatible Frames: Not specified
  • Installation Type: Panel mount
  • Item QTY: 1
  • Nema Starter Size: N/A
  • Breaker Frame: 1-inch
  • Current Rating: 20 A
  • Reverse Standoff Voltage: N/A
  • Watts: Not specified
  • Peak Pulse Current: N/A
  • Breakdown Voltage (MIN VBR@IT ) (V): N/A
  • Breakdown Voltage (VBR@IT) (V): N/A
  • Polarity: N/A
  • Operating Temperature Maximum Celsius: 40°C
  • Max Clamp Voltage: N/A
  • On-State Current: N/A


Product Identification
  • UPC: 75455426185
  • GTIN: 00754554261850