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Home > Circuit Breaker > Wholesale SJKM1E Molded Case Circuit Breaker ECB Factories, Factory
Wholesale SJKM1E Molded Case Circuit Breaker ECB Factories, Factory
Wholesale SJKM1E Molded Case Circuit Breaker ECB Factories, Factory
Wholesale SJKM1E Molded Case Circuit Breaker ECB Factories, Factory
Wholesale SJKM1E Molded Case Circuit Breaker ECB Factories, Factory
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Wholesale SJKM1E Molded Case Circuit Breaker ECB Factories, Factory
Wholesale SJKM1E Molded Case Circuit Breaker ECB Factories, Factory
Wholesale SJKM1E Molded Case Circuit Breaker ECB Factories, Factory
Wholesale SJKM1E Molded Case Circuit Breaker ECB Factories, Factory

Wholesale SJKM1E Molded Case Circuit Breaker ECB Factories, Factory

The SJKM1E Molded Case Circuit Breaker ECB delivers comprehensive circuit protection for 400V AC systems (50/60Hz, up to 800A). Featuring adjustable overcurrent, short-circuit (instantaneous/delayed), and optional undervoltage/phase-failure protection, this SJKM1E ECB ensures reliable power distribution with minimized downtime. Available in M-type and H-type (high-breaking capacity) versions, it offers 800V insulation and superior arc resistance. With vertical/horizontal installation options and isolation capability (symbol: -), this IEC60947-compliant circuit breaker supports industrial automation through "Z"/"B" type units with communication interfaces for remote monitoring. 

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Product Description

Type Designation

Type Designation
CodeDescription
Business CodeMolded Case Circuit Breaker(MCCB) Designation
Design codeElectronic Release
Frame CurrentRating (A)
Breaking CapacityRated Ultimate Three-Phase Breaking Capacity Class
ModeOperation Mode / Number of poles
MechanismRelease Mechanism Type and Accessory Code

Usage Environment Conditions

  • Altitude: ≤ 2000 m; Ambient temperature: -5°C ~ +40°C;
  • Environmental Resistance: Resistant to humid air, salt mist, and oil mist;
  • Installation Category: Main circuit is III, auxiliary and control circuits are II;
  • Humidity: Relative humidity ≤ 50% at +40°C. Special measures required for condensation;
  • Inclination: Maximum inclination: 22.5°;
  • Medium: Non-explosive, free from gases and conductive dust that corrode metal or damage insulation;
  • Protection: Indoor use, protected from rain and snow.

Product Display

Product Display 1 Product Display 2 Product Display 3

Product Structure and Marking Instructions

Structure 1 Structure 2
  • I1 (Overload long-time delay trip current): 4th to 10th gear adjustment.
  • t1 (Long-time delay action time): 4 adjustable gears.
  • I2 (Short-time delay trip current): 10 adjustable gears.
  • t2 (Short-time delay action time): 4 adjustable gears.
  • I3 (Instantaneous trip current): 8th, 9th, or 10th gear adjustment.
  • Ir0 (Pre-alarm trip current): 7 adjustable gears.
  • Test terminal: Used for undervoltage release testing.

Technical Parameters

ModelSJKM1E-125SJKM1E-250
Rated Current In (A)16-125 Adjustable100-250 Adjustable
Rated Voltage Ue (V)AC400AC400
Rated Insulation Voltage Ui (V)AC800AC800
Short-circuit Breaking (Icu/kA)50 / 8550 / 85
Dimensions

Frequently Asked Questions

Q: What is the altitude limit for this circuit breaker?
A: The circuit breaker is designed to operate at altitudes up to 2000 meters.
Q: How can I adjust the overload trip current?
A: You can adjust the I1 overload long-time delay trip current using the settings from the 4th to 10th gear.
Q: What ambient temperature range is suitable for installation?
A: It is recommended to install the device in an environment where the temperature is between -5°C and +40°C.
Q: Does the device support 4-pole configurations?
A: Yes, the circuit breaker supports both 3-pole and 4-pole configurations depending on the specific model requirements.
Q: What is the rated insulation voltage of these circuit breakers?
A: The rated insulation voltage (Ui) for these units is AC800V.
Q: Are these circuit breakers suitable for humid environments?
A: They are resistant to humid air, but special measures should be taken if condensation occurs due to temperature changes.

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