Miniature Circuit Breaker 3P 20 A Curve C

Miniature circuit breaker from the Multi 9 range, designed to protect electrical circuits in direct current. Provides thermal-magnetic protection against overloads and short circuits, with a rated current of 20 A at 25 °C and Curve C trip characteristic. Used in direct current installations with nominal voltages of 240 V DC, 415 V DC, and 440 V DC.

Technical Features

• Number of poles: 3P
• Number of protected poles: 3
• Rated current [In]: 20 A at 25 °C according to Icu
• Network type: DC
• Tripping unit technology: Thermal-magnetic
• Curve code: C
• Breaking capacity: 10 kA air at 480Y/277 V DC according to UL 1077 and CSA C22.2 No 235
• Rated operating voltage [Ue]: 240 V DC, 415 V DC, 440 V DC
• Rated insulation voltage [Ui]: 500 V DC
• Surge voltage withstand [Uimp]: 6 kV
• Service breaking capacity [Ics]: 15 kA 75 % according to Icu at 240 V DC
• Total power losses: 6.6 W
• Power losses per pole: 2.2 W
• Switching capacity: Yes according to Icu
• Contact position indicator: Yes
• Control: Handle
• Local indicators: On/Off indication
• Mounting type: DIN rail
• Mounting support: Door switch
• Connection spacing: 18 mm between phase and neutral
• 9 mm steps: 6
• Dimensions: 81 mm (height) × 54 mm (width) × 72 mm (depth)
• Color: Grey
• Mechanical durability: 20 000 cycles
• Electrical durability: 10 000 cycles
• Lockable: With lock
• Connections: Tunnel terminal, for rigid and flexible cables (1–25 mm², AWG 18–8)
• Stripping length: 14 mm
• Torque: 2.5 N·m
• Protection degree IP: IP20
• Contamination degree: 3
• Tropicalization: 2
• Relative humidity: 95 % at 55 °C
• Operating altitude: 0–2000 m
• Operating ambient temperature: -30 °C to 70 °C
• Storage ambient temperature: -40 °C to 80 °C
• Standards: Icu GB 14048.2, UL 1077, CSA C22.2 No 235
• Certifications: IEC, CCC, UR, CSA