1-Pole (1P) 40A DC Miniature Circuit Breaker — 250V DC, 6kA
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SKU: CTDC5-6340
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The GDDC5-63 1-Pole 40A DC Miniature Circuit Breaker (MCB) is engineered for precise overload and short-circuit protection in single-pole DC circuits up to 250V DC. This 40A model is ideal for higher-current branch protection in photovoltaic arrays, battery energy storage systems, telecom DC distribution, and industrial DC control panels. Compact at just 18 mm wide, it supports infrequent manual switching under normal conditions and features a front contact position indicator for quick operational status checks. For higher voltage or multi-pole applications, matching 2P (500V DC) and 4P (1000V DC) versions are available.
Electrical Features
| Poles | 1P (single-pole) — optional: 2P / 4P |
|---|---|
| Rated current (In) | 40 A (this model) — also available: 6, 10, 16, 20, 32, 50, 63 A |
| Rated voltage (Ue) | 250 V DC |
| Insulation voltage (Ui) | 1000 V DC |
| Breaking capacity (Icu) | 6 kA |
| Impulse withstand (Uimp) | 6 kV |
| Dielectric test | 2 kV for 1 minute |
| Trip characteristics | Thermal-magnetic • B / C / D curves (resistive to inrush-heavy loads) |
| Auxiliary frequency | 50/60 Hz |
| Protection | IP20 (finger-safe), contact position indicator |
| Service life | Electrical up to 8,000 ops • Mechanical up to 10,000 ops |
Mechanical & Installation
| Mounting | 35 mm DIN-rail (EN60715) |
|---|---|
| Wiring | Cable / U-type busbar / Pin-type busbar |
| Max conductor size | Up to 25 mm² copper |
| Terminal torque | 2.5 Nm (typical) |
| Ambient operating range | −40 °C to +70 °C |
| Storage temperature | −25 °C to +70 °C |
Dimensions (mm)
| Version | Width | Height | Depth |
|---|---|---|---|
| 1-Pole (1P) | 18 | 82 | ~70 |
| 2-Pole (2P) | 36 | 82 | ~70 |
| 4-Pole (4P) | 72 | 82 | ~70 |
Applications
- PV string and combiner-box protection (250V DC, 1P)
- Battery energy storage (BESS) branch circuits
- Telecom & networking DC distribution
- Industrial control cabinets and DC drives
Why Conversions Tech
- Robust 6kA fault clearing for DC systems
- Compact 18 mm footprint for space-limited panels
- Curve options (B/C/D) to match load profiles
- Compliant with IEC/EN60947-2 for global safety standards
Why Pros Buy Direct from Conversions Tech
Engineered in the USA. Our U.S.-based engineering team designs and specifies our core product lines, and every product we carry — designed in-house or built to our exact specifications by certified partner factories — is quality-verified before it ships. UL/CSA listed where required, NEC compliant.
Cross-reference savings. Direct equivalents to Burndy, Hubbell, and other OEM part numbers at up to 30% less — same specs, same certifications, without the big-brand markup.
Real technical support. Need a torque spec, die reference, or an OEM quote? You’ll speak directly with the Conversions Tech engineering desk — not a script reader — for instant answers, custom kitting, and private-label options.
Fast US fulfillment. Orders in by 2PM ET ship same day from our US warehouse, nationwide ground and expedited.
