Description

GYM10-DC DC Miniature Circuit Breaker — Overview

The GYM10-DC DC MCB is a DC-dedicated miniature circuit breaker designed for direct-current circuits with rated voltage up to 1000V DC and rated current up to 63A, providing overload, short-circuit and isolation protection for photovoltaic (PV) solar systems, battery energy storage, telecom DC power and high-voltage DC switchgear. With a 4.5kA breaking capacity, an 11-fin DC arc-extinguishing chamber and full compliance with IEC/EN 60947-2, the GYM10-DC delivers safe, predictable DC protection while keeping total installed cost low.

Why GYM10-DC? While first-tier brands may offer marginally wider operating-temperature ranges or higher electrical-life figures, GYM10-DC focuses on giving you the essential DC-protection performance demanded by IEC/EN 60947-2 at a noticeably more economical price point — an ideal balance for general-purpose PV, ESS and telecom installations where budget and reliable everyday performance matter most.

Key Features

Built for DC circuits: Suitable for communication power, batteries, high-voltage switchgear and other DC distribution systems — used as an overload and short-circuit protection element.
Complete electrical isolation: Complies with IEC 60947-2, achieving full safety isolation of the protected circuit.
Dedicated DC arc-extinguishing chamber: Because DC current has no natural zero crossing, a specially developed 11-fin cross DC arc chute is fitted to ensure strong arc breaking performance.
Magnetic-blow arc control: Magnets installed at the contact area pull the arc sideways for fast, reliable extinction.
Expandable: Accepts a variety of optional accessories including remote/motorized operating mechanisms, auxiliary contacts, alarm contacts and shunt trips.
Contact-position indicator and dual-flow discharge wiring function for safer operation and faster troubleshooting.
Wiring capacity: 0.5–25 mm², supporting flexible installations.
Environmentally compliant: RoHS 2.0.

Typical Applications

☀ Solar PV

String-level and combiner-box DC protection in residential & commercial PV plants.

🔋 Battery / ESS

Overload & short-circuit protection for battery banks in energy-storage systems.

📡 Telecom DC

48V/110V/220V DC distribution in telecom power-supply cabinets.

⚡ HVDC Switchgear

Branch protection inside high-voltage DC switchboards and distribution panels.

Product Model Designation

GYM10	H	DC
Product model (MCB)	T: Single busbar H: Double flow discharge	Direct Current version

Outline & Installation Dimensions

Dimension	1P	2P	3P	4P
Width (mm)	18	36	54	72
Height (mm)	86.5 ± 0.3 (mounted on 35 mm DIN rail)
Depth (mm)	80 (overall) / 50 (front protrusion)
DIN-rail Slot (mm)	45

Outline Overall And Installing Dimensions：

Case：

Technical Parameters & Specifications

Parameter	Specification
Model	GYM10-DC (also marked GYM10H-DC)
Product Type	DC Miniature Circuit Breaker (DC MCB)
Standards	IEC/EN 60947-2, GB/T 14048.2
Rated Current (In)	6, 10, 16, 20, 25, 32, 40, 50, 63 A
Rated Voltage (Ue)	1P: 250VDC · 2P: 500VDC · 3P: 750VDC · 4P: 1000VDC
Rated Insulation Voltage (Ui)	500 V
Rated Impulse Withstand Voltage (Uimp)	4 kV
Breaking Capacity (Icu)	4.5 kA
Tripping Curves	B: (6±20%)In · C: (8.5±20%)In · D: (12±20%)In
Poles	1P / 2P / 3P / 4P
Mechanical Life	20,000 operations
Electrical Life	4,000 operations
Tightening Moment	2.0 N·m
Wiring Capacity	0.5 – 25 mm²
Protection Class	IP20
Arc Extinguishing	11-fin cross DC arc chute + magnetic-blow design
Mounting	35 mm standard DIN-rail
Environmental	RoHS 2.0 compliant
Indicator	Contact position indication window
Wiring Function	Dual-flow discharge wiring

Temperature Compensation

When the ambient temperature deviates from the reference of 30 °C, multiply the rated current (In) by the correction factor below to obtain the effective continuous current.

Ambient Temp.	-20°C	-10°C	0°C	10°C	20°C	30°C	40°C	50°C	60°C
Correction Factor	1.25	1.20	1.15	1.10	1.05	1.00	0.95	0.90	0.85

Tripping Curves (B / C / D)

The GYM10-DC is available in three magnetic tripping characteristics so it can be matched to different DC load types:

Curve	Magnetic Trip Range	Typical Application
B	(6 ± 20%) × In	Resistive loads, long cable runs, low inrush DC circuits
C	(8.5 ± 20%) × In	General DC circuits, PV strings, telecom DC loads (most common)
D	(12 ± 20%) × In	High inrush loads, DC motors, capacitive battery banks

X-axis: multiples of rated current (×In). Y-axis: tripping time (seconds). Refer to the tripping curve diagrams in the product gallery.

Click Here To Download The GYM10 Series INMETRO Certification

INMETRO: The GYM10 Series MCB has passed INMETRO’s rigorous testing. This certification guarantees that our GYM10 MCB complies with the safety and performance regulations of the Brazilian market, providing customers with reliable and safe MCB products.

In same series: GYM10 DC-4.5KA-1P, GYM10 DC-4.5KA-2P, GYM10 DC-4.5KA-3P, GYM10 DC-4.5KA-4P

Frequently Asked Questions

Q1. What is the GYM10-DC DC MCB?

The GYM10-DC is the DC version of the GYM10 series miniature circuit breaker. It is purpose-built for direct-current circuits up to 1000V DC / 63A and provides overload, short-circuit and isolation protection. Its key DC-specific feature is the 11-fin cross-type arc-extinguishing chamber combined with magnetic-blow contacts, which solves the difficulty of breaking DC arcs (DC has no natural zero crossing). It is compact (18 mm per pole), DIN-rail mountable, complies with IEC/EN 60947-2, and is suitable for PV, ESS, telecom DC and HVDC switchgear.

Q2. What functions does it provide?

Overload protection — thermal-bimetal element trips on sustained overcurrent.
Short-circuit protection — instantaneous electromagnetic trip per B/C/D curve.
Isolation — full disconnect with positive contact-position indication.
Manual switching — suitable for infrequent on/off operations of DC circuits.
Dual-flow discharge wiring for flexible installation.
Expandable functions via auxiliary contacts, alarm contacts, shunt trip, and remote/motorized operating mechanisms.

Q3. Which key parameters drive model selection?

System DC voltage — determines the required pole count: 1P/250V, 2P/500V, 3P/750V, 4P/1000V (poles are series-connected to share the voltage).
Rated current (In) — must be ≥ the maximum continuous load current, adjusted by the temperature-compensation factor.
Prospective short-circuit current — must be lower than the 4.5 kA breaking capacity.
Tripping curve (B / C / D) — match to load inrush characteristics.
Ambient temperature — apply the correction factor (1.25 at -20 °C down to 0.85 at 60 °C).
Accessory requirements — auxiliary contacts, alarm, shunt trip, motor operator, etc.

Q4. What configuration options are currently available?

Poles: 1P, 2P, 3P, 4P
Rated current: 6, 10, 16, 20, 25, 32, 40, 50, 63 A
Tripping curves: B, C, D
Voltage (by poles): up to 250 / 500 / 750 / 1000 VDC
Accessories: auxiliary contact (AX), alarm contact (AL), shunt trip (MX), under-voltage release (MN), remote/motorized operating mechanism

Please contact us with your required In / poles / curve / accessory combination for a quotation.

Q5. Which standards does it meet, and which markets is it designed for?

The GYM10-DC is designed and tested to IEC/EN 60947-2 (low-voltage switchgear — circuit-breakers) and GB/T 14048.2, and is RoHS 2.0 compliant. With its 1000VDC capability and DIN-rail format, it targets:

European, Asia-Pacific and Latin-American PV / ESS / telecom markets that specify IEC/EN-compliant DC MCBs;
OEM/ODM customers building solar combiner boxes, battery cabinets, telecom DC power shelves and HVDC distribution panels;
Projects that need reliable, certified DC protection at a competitive price — the GYM10-DC delivers the essential IEC-grade DC-breaking performance without the premium cost of first-tier brands, making it the right choice when budget and dependable everyday performance both matter.

Q6. What installation precautions should I follow?

Respect polarity & pole-count vs. voltage: Use the correct number of poles for the system DC voltage (1P→250V, 2P→500V, 3P→750V, 4P→1000V). Wire incoming/outgoing terminals in line with the polarity markings on the housing.
Mounting: Install vertically on a 35 mm DIN-rail inside a dry, dust-protected enclosure (IP20 device — the enclosure must provide the final ingress protection).
Spacing & ventilation: Leave adequate spacing between adjacent breakers and from heat sources to allow free air circulation; the rated current must be derated using the temperature-compensation factor above 30 °C.
Tightening torque: Tighten the terminal screws to 2.0 N·m using a wire size within 0.5–25 mm². Avoid bare-wire whiskers outside the terminal.
Pre-energizing test: Before commissioning, verify continuity, insulation resistance and correct ON/OFF indication via the contact-position window.
Maintenance: Periodically operate the breaker manually to confirm mechanical operation; replace if the device has interrupted a fault current close to its 4.5 kA rating.
Do not exceed ratings: Never apply AC voltage to a DC MCB or vice-versa, and never bypass the trip mechanism.

GYM10-DC 6-63A 1P-4P DC Miniature Circuit Breaker