Molded Case Circuit Breaker - MCCB

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

JINGE CM1L transparent residual current molded case circuit breaker integrates leakage, overload and short-circuit triple protection, upgraded with visible transparent housing on the basis of standard CM1L industrial MCCB series. Combined with mature industrial protection technology and visual safety design, it meets high-standard power distribution demands for factories, construction sites and commercial complexes with strict electric shock prevention and electrical fire protection requirements.

This transparent MCCB works steadily in 50/60Hz, 400/415V AC industrial power systems, covering 100A to 630A full frame current. The transparent cover allows direct observation of internal contact status, arc extinction components and tripping conditions, realizing rapid fault judgment and daily visual inspection. With standardized industrial design and complete certification documents, it is a high-value upgraded leakage protection solution for global engineering and wholesale customers.

Key Adventages

Transparent visible housing design: Real-time view of internal contact operation, component condition and trip state, solving the maintenance pain point of traditional opaque MCCB with hidden faults and difficult inspection.
3-in-1 full protection: Integrated residual current leakage, overload long-delay and short-circuit instantaneous protection, preventing electric shock injury, insulation aging and electrical fire risks.
Ultra-fast leakage tripping response: ＜0.1s quick cut-off for leakage failure, suitable for humid, dusty and harsh industrial working conditions.
High industrial breaking capacity: Adopts optimized arc extinguishing system and high-strength conductive parts, stable performance under heavy load and short-circuit impact.
Adjustable leakage sensitivity: Multiple leakage current levels optional (100mA/300mA/500mA), flexible for equipment protection, personal safety and fire prevention scenarios.
Industrial flame-retardant transparent material: High-temperature resistant, impact-resistant and anti-aging transparent engineering plastic, ensuring insulation safety and long service life.
Unified installation & strong compatibility: Same mounting size and wiring method as standard CM1 MCCB, easy replacement, cabinet matching and on-site rapid installation.
Foreign trade mainstream certified model: Widely adopted for CE testing in low-voltage electrical industry, complete test reports and compliance files support smooth customs clearance and project acceptance.

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
Operating Performance (Times)	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
Maximum Breaking Time(S)	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

Application Scenarios

CM1L transparent leakage molded case circuit breaker is specially customized for high-demand industrial and public power distribution occasions. It is widely used in factory main incoming lines, workshop power distribution cabinets, construction site temporary power supply, mining, chemical industry, municipal engineering, commercial buildings and large public facilities.

With the dual advantages of **industrial leakage protection + transparent visual maintenance**, it is highly suitable for scenarios requiring regular safety inspection, frequent equipment maintenance and strict electrical safety supervision. For overseas distributors, system integrators and engineering contractors, CM1L transparent version is a differentiated high-end selection to enrich product lines, improve project safety standards and enhance market competitiveness.

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

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

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

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