Molded Case Circuit Breaker - MCCB

XYCM1LE MCCB Molded Case Circuit Breaker with transparent case

XYCM1L(M1L) MCCB Molded-Case-Circuit-Breaker 125A-800A with transparent case

CM1LE series residual current circuit breakers (hereinafter referred to as circuit breakers) are mainly applicable to circuits with AC 50Hz, rated insulation voltage 800V, rated operating voltage 400V, and rated current up to 630A. They provide indirect contact protection for personal electric shock with fatal danger, and can also be used to prevent fire hazards caused by earth fault current due to equipment insulation damage. They can be used for overload, short circuit and undervoltage protection of lines, and can also be used for infrequent switching of lines.
This series of circuit breakers complies with IEC60947-2 and GB/T14048.2 “Low-voltage switchgear and controlgear Low-voltage circuit breakers” and Appendix B (Circuit breakers with residual current protection).

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Main Technical Parameters

XYCM1L Series Residual Current Circuit Breaker Parameter Table

Model XYCM1L-125 XYCM1L-250 XYCM1L-400 XYCM1L-630 XYCM1L-800
Frame Current INM(A) 125 250 400 630 800
Rated Current IN(A) 10、16、20、32、40、50、63、80、100 100、125、160、180、200、225 225、250、315、350、400 400、500、630 630、700、800
Rated Insulation Voltage Ui(V) 800 800 800 800 800
Rated Operating Voltage Ue(V) 230/400 230/400 230/400 230/400 400
Rated Impulse Withstand Voltage Uimp(KV) 8 8 8 8 8
Pole Number 2、3、4 2、3、4 2、3、4 2、3、4 2、3、4
Breaking Capacity Level L、M、H L、M、H L、M L、M、H L、M
Ultimate Short-Circuit Breaking Capacity Icu(KA)AC400V 35、50、65 35、50、65 35、50 35、50、65 45、65
Service Short-Circuit Breaking Capacity Ics(KA)AC400V 22、30、35 22、30、35 25、25 22、30、35 22.5、32.5
Arc Distance(mm) 50 50 50 100 –
Operating Performance (Times) Times/Hour：120 Times/Hour：60 Times/Hour：60 Times/Hour：60 Times/Hour：20
Energized：1500
De-energized：8500		 Energized：1000
De-energized：7000		 Energized：1000
De-energized：4000		 Energized：1000
De-energized：4000		 Energized：1000
De-energized：4000
Rated Residual Operating Current △n(mA) 100、300、500
Residual Current Protection Operating Time 1I△n 2I△n – 5I△n 10I△n
Maximum Breaking Time(S) Non-delayed：0.2 Non-delayed：0.1 – Non-delayed：0.04 Non-delayed：0.04
Delayed：0.5/1.15/2.15 Delayed：0.35/1/2 – Delayed：0.25/0.9/1.9 Delayed：0.25/0.9/1.9
Ultimate Non-operating Time(ms)Delayed 60/500/1000

Working Condition

Normal Operating Conditions

1. Ambient air temperature: The upper limit shall not exceed +40℃, the lower limit shall not be lower than -5℃, and the 24-hour average value shall not exceed +35℃.

2. The altitude of the installation site shall not exceed 2000m.

3. At the maximum temperature of +40℃, the relative humidity of the air shall not exceed 50%. Higher relative humidity is allowed at lower temperatures, e.g., 90% at 20℃. Special measures shall be taken for condensation occasionally caused by temperature changes.

4. Pollution degree: 3.

5. Installation category: Category II.

6. The circuit breaker should generally be installed vertically.

7. The external magnetic field of the circuit breaker installation site shall not exceed 5 times the earth’s magnetic field in any direction.

More Parameters

Inverse Time Delay Tripping Characteristics of Molded Case Circuit Breakers for Distribution

Test Current Name Setting Current Multiple In Conventional Time h Initial State
In≤63A In>63A
Conventional Non-tripping Current 1.05 ≥1 ≥2 Cold State
Conventional Tripping Current 1.30 <1 <2 Hot State

The rated current of the instantaneous release for short-circuit protection is 10In with a standard tolerance of 20%.

Mechanical and electrical operating performance .

Operating Cycle Times

Frame Grade Rated Current Inm(A) Operating Cycles per Hour With Current Without Current Total Times
100 120 1500 8500 10000
225 120 1000 7000 8000
400 60 1000 4000 5000
630 60 1000 4000 5000

The overcurrent limit value that does not cause tripping in the main circuit is 6In.

The circuit breaker shall not malfunction under the impact voltage of 6kV.

Electric operating mechanism: When the circuit breaker is operated by the motor, it can reliably operate at any voltage between 85% and 110% of the rated control current voltage.

Shunt release: When the power supply voltage is any value between 70% and 110% of the rated control voltage, operating the shunt release can make the circuit breaker operate reliably.

Undervoltage release: When the power supply voltage is between 35% and 70% of the rated control voltage, the undervoltage release shall operate. When the power supply voltage is lower than 35%, the undervoltage release shall prevent the circuit breaker from closing. When the power supply voltage is equal to or greater than 85% of the rated working voltage of the undervoltage release, the circuit breaker shall be guaranteed to close reliably.

10. Arc distance ≤50mm (XYCM1L-100/225), ≤80mm (XYCM1L-400/630).

11. Cross-sectional area of connecting wires for circuit breakers (see Table 5 and Table 6)

Table 5 Matching Cross-sectional Area of Connecting Wires for Rated Current ≤400A

Rated Current(A) 16/20 25 32 40/50 63 80 100 125/140 160 180/200/225 250 315/350 400
Wire Cross-sectional Area (mm²) 2.5 4 6 10 16 25 35 50 70 95 120 185 240

Table 6 Matching Cross-sectional Area of Connecting Wires for Rated Current ≤630A

Rated Current(A) Cable Cross-sectional Area Copper Bar Size
Quantity Cross-sectional Area(mm²) Quantity Size(mm×mm)
500 2 150 2 30×5
630 2 185 2 40×5

Installation and Use

Installation and Use

1. Before installation, check whether the shell, handle, terminals, etc. of the circuit breaker are damaged, and verify that the technical data on the nameplate is consistent with the protected equipment.

2. The circuit breaker must be installed in accordance with regulations: 1, 3, 5 represent the power supply terminal, 2, 4, 6 represent the load terminal, and N represents the neutral pole.

3. When leaving the factory, the operating handle of the circuit breaker is in the free tripping position (middle position). To “open” or “close” the circuit breaker, first pull the operating handle to the “open” position to make the operating mechanism “re-engage”, then perform the “open” or “close” operation.

4. When adjusting the residual operating current and residual current breaking time according to actual conditions, the rotary switch should be adjusted to the required position. The overload protection, short-circuit protection, undervoltage release and shunt release of the circuit breaker have been adjusted according to technical requirements at the factory and sealed with red paint at the adjustment points, and shall not be adjusted by the user.

5. The residual current operation test of the circuit breaker shall be carried out once a month. Test method: When the circuit breaker is energized, press the test button to make the circuit breaker operate; tripping of the circuit breaker is qualified. If the circuit breaker cannot open when the test button is pressed, it indicates that the residual current protection function is lost, and the circuit breaker should be immediately removed and sent to the manufacturer for repair.

6. After the circuit breaker trips automatically, the cause must be identified and the fault eliminated before power can be supplied again.

Install Dimension

CM1LE install dimension

Outline and Installation Dimensions of Front Panel Wiring for Circuit Breakers

Model Pole Number Outline Dimensions Installation Dimensions
L1 L2 L3 L4 a b Φd
XYCM1L-125L 3 92max 150max 110max 90max 30±0.14 129±0.32 4×Φ4.5
XYCM1L-125L 4 122max 150.5max 92max 72max 60±0.28 129±0.32 6×Φ4.5
XYCM1L-125L 2 62max 150.5max 110max 90max / 129±0.32 2×Φ4.5
XYCM1L-125L 3 92.5max 150.5max 110max 90max 30±0.14 129±0.32 4×Φ4.5
XYCM1L-125L 4 122.5max 150max 94max 89.5max 60±0.28 129±0.32 6×Φ4.5
XYCM1L-250 3 107max 165.5max 110max 88max 35±0.16 126±0.32 4×Φ4.5
XYCM1L-250 4 142max 165.5max 92max 72max 70±0.32 126±0.32 6×Φ4.5
XYCM1L-250 3 107max 165.5max 110max 88max 35±0.16 126±0.32 4×Φ4.5
XYCM1L-250 2 75max 165.5max 110max 88max / 126±0.32 2×Φ4.5
XYCM1L-250 4 142max 165.5max 107.5max 88max 70±0.32 126±0.32 6×Φ4.5
XYCM1L-400L, M 3 150max 258max 150max 105max 44±0.20 195±0.32 4×Φ7
XYCM1L-400L, M 4 198max 258max 150max 106max 88±0.40 195±0.32 6×Φ7
XYCM1L-630L, M 3 212max 282max 152max 108max 70±0.20 243±0.50 4×Φ7
XYCM1L-630L, M 4 282max 282max 152max 110max 140±0.40 243±0.50 6×Φ7