Claire
Mr.Fu
Claire
SJKM1 Moulded Case Circuit Breaker (MCCB) from China Suppliers for Reliable Power Protection in Factories
Type Designation
| No. | Designation Details |
|---|---|
| ① | Manufacturer Code |
| ② | Molded Case Circuit Breaker Code |
| ③ | Design Code |
| ④ | Frame Size |
| ⑤ | Short-Circuit Breaking Capacity Level 4 |
| ⑥ | Operation method 3 |
| ⑦ | Number of Poles 2 |
| ⑧ | Trip Unit Method & File Code |
| ⑨ | Function Code 1 |
| ⑩ | Type code(See Table 1 for N-pole of four-pole,no code for three-pole) |
Notes:
1. There is no code for distribution circuit breakers; for motor - protection circuit breakers, use 2 to represent.
2. Number of poles: 2 for two - pole; 3 for three - pole; 4 for four - pole.
3. For handle - direct operation: use D to represent for power - distribution use, and use Z to represent for conversion - locking use.
4. For economy type: represent with E; for standard type: represent with M; for higher - reliability type: represent with H; for high - breaking type: represent with L.
Product Display
N - Pole Type Code
| Type Code | Description |
|---|---|
| Type A | No over - current release element is installed on the N - pole, and the N - pole is always connected, and does not close and open together with the other three poles. |
| Type B | No over - current release element is installed on the N - pole, and the N - pole closes and opens together with the other three poles (the N - pole closes first and opens later). |
| Type C | An over - current release element is installed on the N - pole, and the N - pole closes and opens together with the other three poles (the N - pole closes first and opens later). |
| Type D | An over - current release element is installed on the N - pole, and the N - pole is always connected, and does not close and open together with the other three poles. |
Release Modes and Accessory Codes
| Accessory Name | Without Accessory | Alarm Contact | Shunt Release | Auxiliary Contact | Under - voltage Release | Shunt Release Auxiliary Contact | Two - group Auxiliary Contacts | Shunt Release Under - voltage Release | Auxiliary Contact Under - voltage Release | |
|---|---|---|---|---|---|---|---|---|---|---|
| Release Mode | Instantaneous Code | 200 | 208 | 210 | 220 | 230 | 240 | 250 | 260 | 270 |
| Compound Code | 300 | 208 | 310 | 320 | 330 | 340 | 350 | 360 | 370 | |
(Continued from the previous table)
| Accessory Name | Shunt Release Alarm Contact | Auxiliary Contact Alarm Contact | Under - voltage Release Alarm Contact | Shunt Release Auxiliary Contact Alarm Contact | Two - group Auxiliary Contact Alarm Contact | Auxiliary Contact Under - voltage Release Alarm Contact | |
|---|---|---|---|---|---|---|---|
| Release Mode | Instantaneous Code | 218 | 228 | 238 | 248 | 268 | 278 |
| Compound Code | 318 | 328 | 338 | 348 | 268 | 378 | |
Notes:
1) 200 indicates the circuit breaker body with only an electromagnetic release; 300 indicates the circuit breaker body with thermal and electromagnetic releases.
2) For the two - level products SJKM1 - 125 and SJKM1 - 250, only 210, 310, 220, 320, 230, and 330 are available.
Normal Operating Conditions and Installation Conditions
◆
Ambient temperature: The circuit breaker can operate normally at an ambient temperature range of -5°C to +40°C (except for special orders).
◆
Altitude: The altitude of the installation site of the circuit breaker shall not exceed 2000m.
◆
Pollution degree: The pollution degree of the circuit breaker is Grade 3.
◆
Installation category: The installation category of the circuit breaker is Category III.
◆
Installation position: The circuit breaker can be installed horizontally, vertically, or flat, without reducing its electrical performance.
Main Parameters and Technical Performances
| Circuit Breaker Model | SJKM1-63 | SJKM1-125 | SJKM1-250 | SJKM1-400 | SJKM1-630 | SJKM1-800 | SJKM1-1250 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pole Number | 3 | 4 | 3 | 2 | 4 | 3 | 2 | 4 | 3 | 4 | 3 | 4 | 3 | 4 | 3 | 4 | |||
| Rated Current In A | 10 16 20 25 32 40 50 63 | 16 20 25 32 40 50 63 80 100 125 | 100 125 140 160 180 200 225 250 | 225 250 315 350 400 | 400 500 630 | 630 700 800 | 800 1000 1250 | ||||||||||||
| Rated Insulation Voltage Ui (V) | 690 | 1000 | 1000 | 1000 | 1000 | 1000 | 1000 | ||||||||||||
| Rated Impulse Withstand Voltage Uimp V | 6000 | - | - | - | - | 8000 | - | ||||||||||||
| Rated Working Voltage Ue V | 400 | AC400/690 | AC400/690 | AC400/690 | AC400/690 | AC400/690 | AC400/690 | ||||||||||||
| Breaking Capacity Level | L | M | L | M | H | L | M | H | L | M | H | L | M | H | H | H | |||
| Ultimate Short-Circuit Breaking Capacity Icu (kA) (0-tCO) | 400V | 25 | 50 | 35 | 50 | 85 | 35 | 50 | 85 | 50 | 65 | 100 | 50 | 65 | 100 | 100 | 100 | ||
| 690V | - | - | - | - | 25 | - | - | 25 | - | - | 30 | - | - | 30 | - | 25 | |||
| Service Short-Circuit Breaking Capacity Ics (kA) (0-tCOtCO) | 400V | 18 | 30 | 25 | 35 | 50 | 25 | 35 | 65 | 35 | 50 | 65 | 35 | 50 | 65 | 65 | 50 | ||
| 690V | - | - | - | - | 15 | - | - | 15 | - | - | 20 | - | - | 20 | - | 20 | |||
Appearance and Installation Dimensions
◆ Appearance and installation dimensions of the fixed - type front - connected and rear - connected wiring
◆ Appearance and installation dimensions of fixed - type front and rear wiring
| Model | Number | Overall dimensions (mm) | Mounting Dimensions (mm) | Dimensions for Rear Terminal Wiring (mm) | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L | L1 | W | H | H1 | H2 | a | b | φd | al | b1 | d1 | H3 | H4 | ||||||
| SJKM1-63L | 3 | 135 | 21 | 76 | 88 | 72 | 19 | 25 | 117 | 4 | 25 | 117 | 18 | 52 | 75 | ||||
| SJKM1-63M | - | - | - | - | 97 | 82 | 28 | - | - | - | - | - | - | - | - | ||||
| SJKM1-63 | 4 | - | - | 103 | - | - | - | - | - | - | - | - | - | - | - | ||||
| SJKM1-125L | - | 150 | 51 | 92 | 86 | 68 | 24 | 30 | 129 | 4.5 | 30 | 132 | 22 | 65 | 100 | ||||
| SJKM1-125M | 3 | - | - | - | 104 | 86 | 23 | - | - | - | - | - | - | - | - | ||||
| SJKM1-125H | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | ||||
| SJKM1-125 | 2 | - | - | 65 | - | - | - | --- | - | - | - | - | - | - | - | ||||
| 4 | 122 | 30 | |||||||||||||||||
| SJKM1-250L | - | 165 | 64 | 107 | 108 | 87 | 25 | 35 | 126 | 5.5 | 35 | 144 | 24 | 70 | 110 | ||||
| SJKM1-250M | 3 | 165 | - | 107 | 124.5 | 104 | 24.5 | - | - | - | - | - | - | - | - | ||||
| SJKM1-250H | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | ||||
| SJKM1-250 | 2 | - | - | 75 | - | - | - | -- | - | - | - | - | - | - | - | ||||
| 4 | 142 | - | |||||||||||||||||
| SJKM1-400 | 3 | 257 | 105 | 149 | 150 | 100 | 36.5 | 44 | 195 | 6.5 | 44 | 225 | 32 | 70 | 120 | ||||
| 4 | 198 | ||||||||||||||||||
| SJKM1-630 | 3 | 270 | 118 | 182 | 155 | 108 | 41 | 58 | 200 | 7 | 58 | 234 | 40 | 70 | 120 | ||||
| 4 | 240 | ||||||||||||||||||
| SJKM1-800 | 3 | 282 | 102 | 210 | 158 | 103 | 34.5 | 70 | 243 | 7 | 70 | 243 | 48 | 70 | 125 | ||||
| 4 | 280 | ||||||||||||||||||
| SJKM1-1250 | 3 | 406 | 104 | 210 | 190 | 140.5 | 58.5 | 70 | 375 | 10 | - | - | - | - | - | ||||
| Handle | H | W | Protrusion in the middle | L | W | H | |||||||||||||
| 63 | 17 | 13.5 | 63 | 44 | 22 | 5.5 | |||||||||||||
| 125 | 19 | 13 | 125 | 51 | 23 | 5.5 | |||||||||||||
| 250 | 22 | 12.5 | 250 | 52 | 23 | 4 | |||||||||||||
| 400 | 43.5 | 33.5 | 400 | 89.5 | 65 | 7 | |||||||||||||
| 630 | 44 | 33.5 | 630 | 90 | 65.5 | 7 | |||||||||||||
| 800 | 40 | 33.5 | 800 | 105 | 61 | 5 | |||||||||||||
| 1250 | 51 | 41 | 1250 | 100 | 78 | 16 | |||||||||||||
◆ Appearance and installation dimensions of the plug - in type front - connected wiring
◆ Appearance and installation dimensions of plug - in type rear - panel wiring
| Model | W | L | A | H1 | G | G1 | a | b | d |
|---|---|---|---|---|---|---|---|---|---|
| SJKM1-63 | 75 | 135 | 18 | 28 | 17 | 15 | 50 | 60 | 6 |
| SJKM1-125 | 92 | 170 | 38 | 50 | 33 | 28 | 60 | 56 | 6.5 |
| SJKM1-250 | 107 | 186 | 46 | 50 | 33 | 40 | 70 | 54 | 7 |
| SJKM1-400 | 144 | 280 | 50 | 60 | 40 | 48 | 88 | 143 | 9 |
| SJKM1-630 | 182 | 300 | 65 | 60 | 40 | 53 | 100 | 123 | 9 |
| SJKM1-800 | 212 | 298 | 57 | 100 | 43 | 129 | 140 | 143 | 9 |
◆ Outline and Installation Schematic Diagram of Withdrawable Device
◆ Outline and Installation Dimensions of Withdrawable Device
| Model | pole | overall dimensions | installation dimensions | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L1 | L2 | L3 | H1 | H2 | H3 | W1 | W2 | φd1 | A | B | φd2 | ||
| SJKM1-400/M | 3P | 310 | 339 | 203 | 253 | 17.5 | 77 | 48 | 223 | φ11 | 96 | 134 | φ6.5 |
| 4P | 310 | 339 | 203 | 253 | 17.5 | 77 | 48 | 271 | φ11 | 144 | 134 | φ6.5 | |
| SJKM1-630/M | 3P | 341 | 381 | 211 | 282 | 17.5 | 92 | 58 | 253 | φ13 | 116 | 140 | φ6.5 |
| 4P | 341 | 381 | 211 | 282 | 17.5 | 92 | 58 | 311 | φ13 | 174 | 140 | φ6.5 | |
| SJKM1-800/M | 3P | 367 | 410 | 241 | 238 | 26 | 73 | 70 | 289 | φ13 | 140 | 131 | φ6.5 |
| 4P | 367 | 410 | 241 | 238 | 26 | 73 | 70 | 359 | φ13 | 210 | 131 | φ6.5 | |
Frequently Asked Questions (FAQ)
What are the normal operating temperature conditions for SJKM1 MCCBs?
The SJKM1 moulded case circuit breaker operates normally within an ambient temperature range of -5°C to +40°C. For requirements outside this range, special customized orders are available.
What is the maximum installation altitude for the SJKM1 circuit breaker?
The installation site altitude for the SJKM1 circuit breaker should not exceed 2000 meters to ensure standard technical performance.
Can the SJKM1 circuit breaker be installed horizontally?
Yes. The SJKM1 series can be installed vertically, horizontally, or flat without reducing its electrical performance.
What is the difference between N-pole Type A and Type B configurations?
Type A has no over-current release element on the N-pole, is always connected, and does not open/close dynamically with the other three poles. Type B also has no over-current release, but it closes and opens together with the other three poles (closes first, opens later).
What do the release mode codes 200 and 300 stand for?
Code 200 indicates a circuit breaker body equipped only with an electromagnetic release, whereas code 300 represents a configuration with both thermal and electromagnetic releases.
What is the pollution degree rating and installation category of this MCCB?
The SJKM1 circuit breaker has a Pollution Degree of Grade 3 and belongs to Installation Category III.