MCCB with Leakage Protection

Enhance electrical safety beyond overload and short-circuit protection with the CDADA DAM1L Series MCCB with Leakage Protection an integrated moulded case circuit breaker with built-in residual current (RCD/ELCB) functionality. Designed by the professional manufacturer Shanghai DADA Electric CO., LTD to international standards, this leakage MCCB 4P combines high-performance power distribution with life- and fire-saving ground fault detection.

Rated from 10A to 500A at 400V/415V, it offers adjustable residual operating current (30mA–1000mA) and optional time delay—enabling tailored protection for personal safety (≤30mA) or fire prevention (100mA–500mA+). With multi-phase powered electronics, it remains operational even if one phase fails or voltage drops to 50V, ensuring unmatched reliability in critical infrastructure like tunnels, high-rises, transportation hubs, and industrial plants.

Key Specifications

Model: DAM1L Series – Earth Leakage MCCB (CBR-type MCCB)

Poles: 4P (standard; 3P available on request)

Rated Current (In): 10A – 500A

Rated Voltage: 400V / 415V AC, 50Hz

Insulation Voltage (Ui): 400V (≤160A), 690V (>250A)

Residual Current Settings (I△n): 30mA, 100mA, 300mA, 500mA, 1000mA

Adjustability: On-site adjustment of I△n and trip time (instantaneous or delayed)

Breaking Capacity Types:

B Type: Basic (Inm < 100A)

S Type: Standard

H Type: High breaking (>160A)

Certifications: CE, CB, SEMKO

Key Features:

★ Multi-phase powered RCD circuit → works down to 50V

★ Separate main & arcing contacts

★ Push-to-trip test button

★ Adjustable magnetic setting (0.8–1.0×In)

★ Strong EMI/RFI anti-interference capability

★ Full accessory range: shunt trip, auxiliary/alarm contacts, rotary handle

Technical data sheet

Earth-Leakage Circuit Breakers(ELCB)
Model			DAM1-125L			DAM1-160L
Breaking Capacity Code			B	N	S	B	N	S
Rated Current of Frame size- Inm (A)			125A			160A
Rated Current-In(40,50 or 55℃) (A)			10 - 12,5 - 16 - 20 - 25 - 32(30) - 40 - 50 - 63(60) - 80 - 100 - 125A			10- 12,5-16-20 - 25 - 32 - 40 - 50 - 63 - 80 - 100 -125 - 160(150)A
Ui (V)			690V			690V
Ue (V)			400V			400/415V
Number of Pole			4P			4P
Icu (KA)			25	35	50	25	35	50
Ics(KA)			12.5	17.5	37.5	12.5	26.25	37.5
Icm(peak)/cos ф (KA)			40/0.3	73.5/0.25	105/0.25	41/0.3	73.5/0.25	110/0.25
(I△m)KA/cosф			9/0.5			19/0.5
Residual current threshold(mA)			100-300-500			100-300-500
Time delay(ms)			50-500-800			50-500-800
Uimp (V)			10000			8000
Dielectric Propery (V)			2500			3000
lonization distance (mm)			≤30/0			≤30/0
Endurance	Total Cycles		8000			8000
	Electrical Life		1000			1000
	Mechanical Life		7000			7000
Category (EN 60947-2/IEC 60947-2)	Main circuit		A/0			A/0
	Auxiliary circuit		AC-15			AC-15
Under Voltage Release			√			√
Shunt Release			√			√
Auxiliary Contact			√			√
Alarm Contact			√			√
Auxiliary Contact and Alarm Contact			√			√
Handle Operation Mechanism			√			√
Electrical Operastion Mechanism			√			√
Terminal cover			√			√
Phase seperator			√			√
	W (mm)	3P	-			-
		4P	101			120
	L (mm)	3P	-			-
		4P	155			120
	H (mm)	3P	-			-
		4P	70			70
Weight	Fixed version 3P/4P		-			-
	Plug-in version 3P/4P		-			-
	Draw out version 3P/4P		-			-

Why Choose CDADA MCCB with Leakage Protection?

★ True Integrated Safety

Unlike add-on RCD modules, the DAM1L has built-in, factory-calibrated leakage protection—ensuring perfect coordination and eliminating compatibility issues.

★ Multi-Phase Power for RCD Circuit

Early RCDs failed if one phase was lost. CDADA’s design uses all phases to power the protection electronics, so it keeps working even during phase loss or severe undervoltage.

★ Dual Protection Goals in One Device

◆ 30mA: Meets IEC requirements for personal shock protection

◆ 100mA–1000mA: Prevents insulation degradation fires from small, persistent ground faults

★ Field-Adjustable for Real-World Conditions

Fine-tune sensitivity and time delay to avoid nuisance tripping in wet environments (e.g., car washes, farms) while maintaining safety.

★ Industrial-Grade Reliability

High breaking capacity (H-type), robust arc separation, and IP20+ terminal protection make it suitable for harsh commercial and industrial settings.

★ Global Compliance, Local Value

Certified for Europe (CE/CB), Nordic countries (SEMKO)—ideal for export projects—with competitive pricing from a trusted Chinese manufacturer.

★ Our manufacturing facility is certified under the ISO9001:2015 Quality Management System.

Typical Applications

High-Rise Residential: Main incomer or floor panels (300mA for fire risk reduction)

Tunnels & Subways: Critical infrastructure requiring fail-safe leakage detection

Hospitals & Schools: 30mA protection in wet areas (labs, restrooms)

Industrial Plants: Motor feeders with ground fault monitoring

Construction Sites: Temporary power distribution with personnel protection

FAQ

Q1: What’s the difference between a standard MCCB and an MCCB with leakage protection?

A1: A standard MCCB only protects against overload and short circuits. The DAM1L adds residual current (earth leakage) detection—tripping when current leaks to ground (e.g., through a person or damaged insulation), preventing electric shock or fire.

Q2: Can I use a 100A MCCB RCD for personal protection?

A2: Only if set to 30mA. The rated current (100A) defines load capacity; the residual setting (I△n) defines safety function. For shock protection, I△n must be ≤30mA, regardless of In.

Q3: Why does the RCD circuit need multi-phase power?

A3: If powered by only one phase, a single-phase failure would disable leakage protection. CDADA’s multi-phase design ensures the RCD remains active even during phase loss or low voltage (down to 50V)—critical for safety continuity.

Q4: Is the 4P leakage MCCB suitable for TT or TN-S systems?

A4: Yes—it’s designed for TT, TN-S, and IT systems. The 4P design breaks all phases and neutral, essential for TT systems where neutral isn’t reliably grounded upstream.

Q5: Why choose CDADA over modular RCD + MCCB combinations?

A5: CDADA DAM1L offers:

● Smaller footprint (integrated vs. two devices)

● Guaranteed coordination (no mismatch risk)

● Lower cost & wiring complexity

● Higher reliability (single sealed unit)

● On-site adjustability not possible with fixed-sensitivity RCDs