Proven protection against AC residual currents
Residual current circuit-breakers are one of the most fundamental safety components in any electrical installation. The DFS Type AC range from Doepke represents the original form of residual current protection — reliable, robust, and designed for applications where pure alternating residual currents are expected.
Manufactured in Germany and individually tested, DFS Type AC devices deliver dependable protection with a long service life and minimal power loss.
What Is a Type AC Residual Current Circuit-Breaker?
Type AC RCCBs are designed to detect sinusoidal alternating residual currents only. These occur in traditional electrical loads without electronic control systems.
DFS Type AC devices operate independently of the mains voltage, ensuring reliable tripping even under unstable supply conditions.
Key Features of DFS Type AC
✅ Protection against AC residual currents
✅ Independent of mains voltage
✅ Minimal power dissipation for energy-efficient operation
✅ Large terminals supporting conductors up to 50 mm²
✅ Double-sided two-tier terminals for:
- Large conductor cross-sections
- Busbar connections
✅ Rated currents up to 125 A
✅ High short-circuit resistance
✅ Made in Germany and 100% individually tested
Designed for Reliability and Simplicity
DFS Type AC devices are engineered with simplicity and robustness in mind. With fewer electronic components than more advanced RCCB types, they offer:
- High mechanical durability
- Reduced risk of false tripping
- Long-term stability in standard installations
This makes them a dependable choice where modern electronic loads are not present.
Typical Areas of Application
DFS Type AC RCCBs are best suited for classic electrical loads, including:
- Lighting circuits with incandescent lamps
- Heating coils and electric heaters
- Hotplates and resistive loads
- Simple electrical circuits without frequency converters
They are commonly installed in:
- Residential buildings
- Utility installations
- Traditional commercial applications
Standards and Compliance
DFS Type AC devices comply fully with international standards:
- Product standard: IEC 61008-1
Installation standards:
- IEC 60364-4-41
- IEC 60364-5-53
This ensures compatibility with modern electrical installation regulations while maintaining proven technology.
When Is Type AC the Right Choice?
Type AC RCCBs are ideal when:
- Loads do not generate pulsating or DC residual currents
- Installations are simple and predictable
- A cost-effective, durable protection solution is required
For installations with electronic equipment, frequency converters, or EV charging, more advanced RCCB types (A, F, or B) should be considered instead.
| Feature | Description |
|---|---|
| Residual current type | AC only |
| Rated current | Up to 125 A |
| Terminal size | Up to 50 mm² |
| Power dissipation | Very low |
| Manufacturing | Made in Germany |
| Testing | Individually tested |
The DFS Type AC from Doepke remains a solid and trusted solution for traditional electrical installations. Where simplicity, durability, and proven safety are required, it delivers reliable residual current protection — without unnecessary complexity.