RCCB

KUANGYA Residual Current Circuit Breaker (RCCB)

Quick Comparison of RCCB Types

Our AC RCCB range covers Type AC, Type A, Type F, and Type B/B+ plus selective Type S. Use this table to select the correct waveform sensitivity and trip characteristic.

TypeWaveform CoverageTypical ApplicationsSensitivity (IΔn)PolesNotes
ACPure sinusoidal AC residual currentStandard residential/commercial loads30 / 100 / 300 mA2P / 4PDo not use where pulsating DC may occur.
AAC + pulsating DCAppliances with power electronics, SMPS10 / 30 / 100 / 300 mA2P / 4PRecommended default for mixed modern loads.
FAC + pulsating DC + high-frequency componentsDrives, UPS, frequency converters30 / 100 mA2P / 4PImproved immunity to nuisance tripping.
B / B+All currents including smooth DCEV charging, PV inverters, industrial VFDs30 / 100 / 300 mA2P / 4PMandatory if smooth DC leakage is possible.
S (Selective)Time-delayed trip (~150–500 ms)Upstream protection for discrimination100 / 300 mA2P / 4PUse upstream of 30 mA devices to avoid blackouts.
Tip
For terminal circuits needing both overload and leakage protection, consider an RCBO. For upstream overcurrent only, coordinate MCB with RCCB.

Key Features & Benefits

  • Residual current protection options: IΔn 10 / 30 / 100 / 300 mA
  • RCCB single phase (2P) and three-phase (4P) versions
  • High conditional short-circuit current (Inc/IΔc) up to 10 kA
  • Clear ON/OFF and status indicator window; front TEST button
  • Selective type (S) for upstream discrimination
  • Wide ambient temperature range for panel builders
  • DIN rail 35 mm mounting (EN 60715), modular widths
  • Terminals suitable for pin/fork busbars and copper conductors
  • High electrical and mechanical endurance
  • Compliance with IEC/EN 61008-1
  • Popular configurations include RCCB 63A 30mA for residential boards
  • Coordination guidelines with MCB, RCBO, and AFDD

Applications & Use Cases

Residential & commercial distribution boards

Use 30 mA Type A for personnel protection.

Industrial panels

Selective Type S upstream; 30 mA downstream on final circuits.

EV infrastructure

Type B/B+ where smooth DC leakage may occur.

Data centers & IT loads

Type F with improved HF immunity for converters/UPS.

Hospitals & public buildings

High reliability and discrimination requirements.

PV / ESS coupling

Coordinate with AC SPD; Type B when required by inverter.

Installation & Wiring

RCCBs do not provide overload or short-circuit protection; always coordinate with an upstream MCB/MCCB.

Important
Observe polarity (L/N), rated sensitivity, and monthly function tests. Neutral must pass through the RCCB.
2P — RCCB single phase (L + N)

Place upstream of branch circuits. Typical residential choice includes RCCB 63A 30mA.

4P — Three-phase (3L + N)

Ensure phase sequence and shared neutral through the device for correct sensing.

Sensitivity selection

30 mA for personnel protection; 100/300 mA for fire protection or upstream selectivity.

Protection Coordination

Layer protection for robust AC systems and proper selectivity.

StackPurposeNotesRelated Category
MCB → RCCBOvercurrent + leakageChoose curve (B/C/D) and IΔn; respect Inc/IΔc values.MCB
RCBO (alternative)Combined in one deviceSimplifies final-circuit protection and wiring.RCBO
RCCB + AFDDLeakage + arc-faultUse in bedrooms, aging wiring, combustible areas.AFDD
RCCB + AC SPDSurge + leakage protectionPlace SPD per coordination rules for upstream devices.AC SPD

Technical Data (General)

Typical envelope values for Kuangya AC RCCB range. Confirm final numbers in the datasheet per model.

ParameterValue / Range
StandardIEC/EN 61008-1
Poles2P (single-phase) / 4P (three-phase)
Rated Current (In)16–125 A — popular: RCCB 63A 30mA
Rated Sensitivity (IΔn)10 / 30 / 100 / 300 mA
Rated Voltage (Ue)240 V~ (2P) / 415 V~ (4P)
Insulation Voltage (Ui)≥ 500 V
Conditional Short-Circuit (Inc/IΔc)6–10 kA with upstream breaker
Impulse Withstand (Uimp)4–6 kV
Tripping ClassInstantaneous; Selective S (≈150–500 ms delay)
Endurance≥ 10,000 mechanical/electrical operations
Terminal CapacityUp to 35 mm² Cu; pin/fork busbar compatible
MountingDIN rail 35 mm (EN 60715)
Operating Temperature−25 °C … +55 °C
Waveform TypesType AC / A / F / B / B+; Selective S
RCCB does not protect against overload or short circuit — coordinate with an upstream MCB or RCBO. Add AFDD where arc-fault protection is required.

Certifications

Series-dependent approvals. Contact us for the exact certificate set per model family.

CE
CB Scheme
UKCA
RoHS
IEC 61008

FAQs — RCCB

What is the difference between RCCB and RCBO?

RCCB detects residual (earth) current only; RCBO integrates residual-current and overcurrent protection in one device for terminal circuits.

When should I use a selective RCCB (Type S)?

Use Type S upstream to achieve selectivity with downstream 30 mA RCDs. The intentional time delay (≈150–500 ms) prevents whole-board trips.

Which RCCB type suits EV chargers or PV?

Use Type B/B+ where smooth DC residual currents are possible (certain EV chargers and PV inverters). Always confirm with the equipment manual.

What does IΔn = 30 mA mean?

It is the sensitivity threshold. 30 mA protects people; 100/300 mA are used upstream for fire protection/selectivity.

Can an RCCB work without an MCB?

No. RCCB does not protect against overload or short circuit. Always coordinate with an upstream MCB or MCCB.

Type AC vs Type A — which should I choose?

Type A is recommended for modern mixed loads because it also detects pulsating DC from power electronics. Type AC is for purely sinusoidal AC loads.

How often should I test an RCCB?

Press the TEST button monthly (or per local regulation) to verify correct trip function. Replace any device that fails the test.

Do I need AFDD together with RCCB?

In fire-risk areas (bedrooms, aging wiring, combustible storage), add an AFDD for arc-fault detection alongside RCCB.