Claire
Mr.Fu
Claire
SJKM1E Molded Case Circuit Breaker ECB: Reliable 400V Circuit Protection from China Suppliers and Factory
Type Designation
| ① | Business Code |
| ② | Molded Case Circuit Breaker (MCCB) Designation |
| ③ | Design Code |
| ④ | Electronic Release |
| ⑤ | Frame Current Rating (A) |
| ⑥ | Rated Ultimate Three-Phase Breaking Capacity Class (Note 1) |
| ⑦ | Operation Mode (Note 2) |
| ⑧ | Number of Poles |
| ⑨ | Release Mechanism Type and Accessory Code |
| ⑩ | Product Type (Note 3) |
Usage Environment Conditions
- Altitude: ≤ 2000 m; Ambient temperature: -5°C ~ +40°C
- Resistant to the effects of humid air
- Resistant to the effects of salt mist and oil mist
- The installation category of the main circuit of the circuit-breaker is III, and the installation categories of the remaining auxiliary circuits and control circuits are II
- When the maximum temperature is +40°C, the relative air humidity shall not exceed 50%. A higher relative humidity is allowed at lower temperatures. Special measures should be taken for the occasional occurrence of condensation due to temperature changes
- Maximum inclination: 22.5°
- In a non-explosive medium, and the medium does not contain gases and conductive dusts that can corrode metals and damage insulation
- In a place without rain and snow attacks
Product Display
Product Structure and Marking Instructions
◆ Circuit Breaker Front Indicator (or Circuit Breaker Faceplate Indications)
- Overload long-time delay trip current I1 adjustment: According to the different rated currents of the circuit breaker, adjustment can be made from 4th to 10th gear
- Long-time delay action time t1 adjustment: 4 gears can be adjusted
- Short-time delay trip current I2 adjustment: 10 gears can be adjusted
- Short-time delay action time t2 adjustment: 4 gears can be adjusted
- Instantaneous trip current I3 adjustment: 8th, 9th, or 10th gear can be adjusted
- Pre-alarm trip current Ir0 adjustment: 7 gears can be adjusted
- Test terminal, used for undervoltage release testing (or trip unit testing)
Technical Parameters
| Model | SJKM1E-125 | SJKM1E-250 | |||||||
| Shell-frame Rated Current Inm (A) | 125 | 250 | |||||||
| Rated Current (Adjustable) In (A) | 16-32A adjustable | 32-63A adjustable | 63-125A adjustable | 100-250A adjustable | |||||||
| Rated Operating Voltage Ue (V) | AC400V | ||||||||
| Rated Insulation Voltage Ui (V) | AC800V | ||||||||
| Rated Impulse Withstand Voltage Uimp (V) | AC800V | ||||||||
| Number of Poles | 3 | 4 | 3 | 4 | |||||
| Rated Ultimate Short-circuit Breaking Capacity Level | M | H | M | H | M | H | M | H | |
| Rated Ultimate Short-circuit Breaking Capacity Icu (kA) | 50 | 85 | 50 | 85 | 50 | 85 | 50 | 85 | |
| Rated Service Short-circuit Breaking Capacity Ics (kA) | 35 | 50 | 35 | 50 | 35 | 50 | 35 | 50 | |
| Rated Short-time Withstand Current Icw (kA)/1s | |||||||||
| Utilization Category | A | A | |||||||
| Operating Performance (times) | Energized | 3000 | 3000 | ||||||
| De-energized | 7000 | 7000 | |||||||
| Overall Dimensions | L | 150 | 165 | ||||||
| W | 92 | 122 | 107 | 142 | |||||
| H | 92 | 90 | |||||||
| Arcing Distance (mm) | ≤50 | ≤50 | |||||||
| SJKM1E-400 | SJKM1E-630 | SJKM1E-800 | |||||||||
| 400 | 630 | 800 | |||||||||
| 200~400A adjustable | 400~630A adjustable | 630~800A adjustable | |||||||||
| AC400V | |||||||||||
| AC800V | |||||||||||
| AC800V | |||||||||||
| 3 | 4 | 3 | 4 | 3 | 4 | ||||||
| M | H | M | H | M | H | M | H | M | H | M | H |
| 75 | 85 | 75 | 85 | 80 | 100 | 80 | 100 | 80 | 100 | 80 | 100 |
| 55 | 65 | 55 | 65 | 60 | 70 | 60 | 70 | 60 | 70 | 60 | 70 |
| 5 | 8 | 10 | |||||||||
| B | B | B | |||||||||
| 2000 | 1500 | 1500 | |||||||||
| 4000 | 3000 | 3000 | |||||||||
| 257 | 280 | 280 | |||||||||
| 150 | 210 | 280 | 210 | 280 | |||||||
| 16.5 | 115.5 | 115.5 | |||||||||
| ≤100 | ≤100 | ≤100 | |||||||||
Overall Dimensions and Installation Dimensions
Frequently Asked Questions (FAQ)
Q1: What is the SJKM1E Molded Case Circuit Breaker (MCCB) used for?
The SJKM1E MCCB is designed to provide overload protection, short-circuit protection, and switching control for electrical distribution systems operating at AC400V. It is suitable for industrial and commercial power distribution panels requiring reliable circuit protection with electronic release functionality.
Q2: What frame current ratings are available for the SJKM1E series?
The SJKM1E series is available in five frame current ratings: 125A, 250A, 400A, 630A, and 800A. Each model supports adjustable rated currents within its respective range to suit various application requirements.
Q3: What is the maximum breaking capacity of the SJKM1E circuit breaker?
The rated ultimate short-circuit breaking capacity (Icu) varies by model and capacity class. For the H-class models, the breaking capacity reaches up to 85 kA for the 125A and 250A frames, and up to 100 kA for the 630A and 800A frames, making it suitable for high-fault-current environments.
Q4: What installation environment conditions are required for the SJKM1E?
The SJKM1E should be installed at altitudes not exceeding 2000 m, with ambient temperatures between -5°C and +40°C. It must be installed in non-explosive, non-corrosive environments, free from rain and snow, and with a maximum installation inclination of 22.5°.
Q5: How many poles are available for the SJKM1E MCCB?
The SJKM1E is available in both 3-pole and 4-pole configurations across all frame sizes (125A, 250A, 400A, 630A, and 800A), providing flexibility for three-phase and three-phase plus neutral distribution systems.
Q6: What protection functions can be adjusted on the SJKM1E electronic release?
The SJKM1E electronic release supports multi-gear adjustment for overload long-time delay trip current (I1), long-time delay action time (t1), short-time delay trip current (I2), short-time delay action time (t2), instantaneous trip current (I3), and pre-alarm trip current (Ir0). It also includes a test terminal for undervoltage release testing.