Next-Generation Residual Current Circuit Breakers (RCD) from Schrack Technik

August 5, 2025

The new Schrack Technik BXFIAxxx (Type A) and BXFIBxxx (Type B) residual current devices offer an extended leakage detection range, LCD diagnostics on selected models, and compliance with the latest IEC 61008 and IEC 62423 safety standards—ensuring enhanced protection for both people and equipment in industrial and commercial installations.

What do residual current devices do?
New RCD series from Schrack Technik
Type A vs Type B — key technical differences
Technical specifications
RCD / RCCB / RCBO — which one to choose?
Where are Type B devices used?
Benefits and best practices

What do residual current devices do?

Residual Current Devices (RCDs) compare phase and neutral current. Upon detecting even a slight imbalance (≤30 mA), the device disconnects the circuit within milliseconds, preventing life-threatening electric shock and potential electrical fires.

New RCD series from Schrack Technik

Schrack Technik has updated its product line by introducing two new series that replace the former BX/BC/MC models. ZTF Lāsma provides full delivery and technical support in Latvia for this next-generation lineup:

Type A – BXFIAxxx — includes models BXFIA100 (without display) and BXFIA101 (with LCD diagnostics).
Type B – BXFIBxxx — first available model BXFIB100 (with LCD).

Type A vs Type B — key technical differences

Type A — AC + pulsed DC leakage

Detects sinusoidal AC and pulsed DC components up to 6 mA.
Suitable for LED lighting, power supplies, single-phase inverters, and frequency converters.

Type B — full-spectrum protection

Detects AC, pulsed DC, smooth DC, and high-frequency components up to 1 kHz.
Recommended for EV chargers, PV inverters, and VFD/servo drives.

Technical specifications

Model	Leakage range	Type	Display	IEC class	Max T_amb	Mounting
BXFIA100	30 mA – 3 A	Type A	—	IEC 61008	+50 °C	DIN rail
BXFIA101	30 mA – 3 A	Type A	LCD	IEC 61008	+50 °C	DIN rail
BXFIB100	30 mA – 3 A	Type B	LCD	IEC 62423	+50 °C	DIN rail

*Compliance according to IEC 61008 (Type A) and IEC 62423 (Type B).

RCD / RCCB / RCBO — which one to choose?

Function	RCD	RCCB	RCBO
Leakage protection	✓	✓	✓
Short-circuit protection	—	—	✓
Overload protection	—	—	✓
Suited for individual circuit	—	—	✓
Requires separate MCB	✓	✓	—

If full protection in one compact unit is the priority (for small distribution boards), choose RCBO. For a more budget-friendly solution, use a combination of RCD + MCB.

Where are Type B devices used?

EV charging stations — regulation 722.531.3 requires ≤30 mA Type B or Type A + 6 mA DC sensor.
PV inverters and UPS systems — smooth DC leakage may saturate classic Type A devices.
Frequency converters (VFD) and servo drives — due to high-frequency components.

Benefits and best practices

LCD diagnostics: Models BXFIA101 and BXFIB100 simplify maintenance by displaying instantaneous leakage and activation count.
Modular design: DIN rail mounting enables quick replacement or expansion in existing panels.
Fire-safe design: RCDs reduce electrical fire risk by approximately 50%.
Regular testing: The “TEST” button should be pressed every six months to verify mechanism function.