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Siemens MMSK01 - 1A Miniature Circuit Breaker (277/480V AC)

Siemens
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The Siemens MMSK01 is a miniature circuit breaker designed for overcurrent protection in industrial control panels and branch circuits. It is rated for 277/480V AC applications with a current rating of 1 amp, featuring a compact 1-inch wide, 3-inch tall, and 2.5-inch deep molded case construction with a thermal-magnetic trip mechanism. This UL 489 listed device complies with CSA and IEC 60947-2 standards, ensuring reliable performance in demanding environments. Typical applications include motor control centers, lighting panels, and distribution boards requiring precise 1A protection.

Key Features & Specifications
  • Type: Miniature circuit breaker, thermal-magnetic trip, molded case
  • Voltage Rating: 277/480V AC
  • Current Rating: 1A
  • Dimensions: 1 in W x 3 in H x 2.5 in D
  • Standards: UL 489, CSA, IEC 60947-2
  • Applications: Industrial control panels, branch circuits, motor control centers
  • Switch Type: Toggle
  • Configuration: 1-pole
  • Coil Voltage Maximum: Not applicable
  • Temp Rating: 40°C
  • Shipping Dimensions: 1.5 in x 3.5 in x 3 in
  • Phase: 1-phase
  • Voltage: 277/480V AC
  • Amperage: 1A
  • AIC rating: 10 kAIC at 277/480V AC
  • Connection: Screw terminals
  • Poles: 1
  • Protection: Overcurrent, short circuit
  • Functions: Overload and short circuit protection
  • Frame Size: 1-inch
  • Trip Type: Thermal-magnetic
  • Panel Type: Industrial control panel
  • Breaker Type: Miniature circuit breaker
  • Control Voltage Minimum: Not applicable
  • Control Voltage Maximum: Not applicable
  • MCM Size: Not applicable
  • Metal Type: Not applicable
  • Panel Style: Not applicable
  • 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 or panel mount
  • Hz: 50/60 Hz
  • Coil Material: Not applicable
  • Horse Power: Not applicable
  • Aux Contacts: Not applicable
  • CPT: Not applicable
  • Full Load Amps: Not applicable
  • Dist Voltage: Not applicable
  • Bucket Size: Not applicable
  • Bucket Style: Not applicable
  • Bucket Type: Not applicable
  • Full Load Amp Maximum: Not applicable
  • Full Load Amp Minimum: Not applicable
  • Enclosure: Open style
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: Not applicable
  • Amperage Maximum: 1A
  • Amperage Minimum: 1A
  • Nema Rating: Not applicable
  • Switch Style: Toggle
  • Wire Size: 14 AWG to 8 AWG
  • Certification: UL 489, CSA
  • Circuit Breaker Mounting Style: DIN rail or panel
  • Terminal Connection: Screw terminals
  • Frequency Rating: 50/60 Hz
  • Phase Connection: Single-phase
  • Standards: UL 489, CSA, IEC 60947-2
  • Compatible Frames: Not applicable
  • Installation Type: Fixed
  • Item QTY: 1
  • Nema Starter Size: Not applicable
  • Breaker Frame: 1-inch
  • Current Rating: 1A
  • 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: 40°C
  • Max Clamp Voltage: Not applicable
  • On-State Current: Not applicable


Product Identification
  • UPC: 75455426177
  • GTIN: 00754554261775