Claire
Mr.Fu
Claire
China SJKM1 Moulded Case Circuit Breaker (MCCB) Factory | Reliable Power Protection from Leading Suppliers
Type Designation
| 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 |
| Release Mode | 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 |
| Release Mode | 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 | a1 | 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 | - | - | - | ||||||
| 手柄 | 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 does the type designation code of the SJKM1 Molded Case Circuit Breaker represent?
The type designation code of the SJKM1 MCCB includes information about the manufacturer code, molded case circuit breaker code, design code, frame size, short-circuit breaking capacity level, operation method, number of poles, trip unit method & file code, function code, and N-pole type code. Each position in the code corresponds to a specific parameter of the product.
What are the differences between the N-pole types (A, B, C, D) in the SJKM1 MCCB?
Types A and B have no over-current release element on the N-pole. Type A keeps the N-pole always connected (independent of other poles), while Type B operates the N-pole together with the other three poles (closing first, opening last). Types C and D have an over-current release element on the N-pole. Type C operates with the other poles (closing first, opening last), while Type D keeps the N-pole always connected.
What are the normal operating and installation conditions for the SJKM1 MCCB?
The SJKM1 MCCB operates normally at ambient temperatures from -5°C to +40°C, at altitudes not exceeding 2000m, with a pollution degree of Grade 3 and installation category of Category III. It can be installed horizontally, vertically, or flat without any reduction in electrical performance.
What breaking capacity levels are available for the SJKM1 MCCB series, and what do they mean?
The SJKM1 MCCB series offers four breaking capacity levels: E (Economy type), M (Standard type), H (Higher-reliability type), and L (High-breaking type). These codes indicate the short-circuit breaking capability and design reliability of the circuit breaker, with higher levels offering increased breaking capacity values (Icu/Ics) at rated voltages.
What accessories are available for the SJKM1 MCCB, and how are they coded?
The SJKM1 MCCB supports a variety of accessories including alarm contacts, shunt releases, auxiliary contacts, under-voltage releases, and combinations thereof. Each configuration is assigned a specific numeric code (e.g., 200 for no accessory, 210 for shunt release only, 220 for auxiliary contact, etc.). Both instantaneous and compound release modes have separate code tables.
What frame sizes and rated current ranges are available in the SJKM1 MCCB series?
The SJKM1 MCCB series covers a wide range of frame sizes from SJKM1-63 up to SJKM1-1250. Rated current ranges vary by frame: SJKM1-63 covers 10A–63A, SJKM1-125 covers 16A–125A, SJKM1-250 covers 100A–250A, SJKM1-400 covers 225A–400A, SJKM1-630 covers 400A–630A, SJKM1-800 covers 630A–800A, and SJKM1-1250 covers 800A–1250A, available in 2-pole, 3-pole, and 4-pole configurations.