4 Pole A-Type 100mA Time Delay RCD
The WCED 4 Pole A-Type 100mA Time Delay RCD is designed for installations requiring selectivity between upstream and downstream RCDs - commonly referred to as RCD discrimination. With 100mA sensitivity and a built-in time delay, these devices help ensure only the correct device trips in the event of an earth...
The WCED 4 Pole A-Type 100mA Time Delay RCD is designed for installations requiring selectivity between upstream and downstream RCDs - commonly referred to as RCD discrimination. With 100mA sensitivity and a built-in time delay, these devices help ensure only the correct device trips in the event of an earth fault, keeping other circuits energised.
Built to BS EN 61008-1 standards and rated at 6kA, these RCDs are ideal for main incomer positions, and are commonly specified in EV, solar, and distribution board setups.
🧩 Available Variants:
- WARTD463-100: 4 Pole, 63A, 100mA Time Delay
- WARTD480-100: 4 Pole, 80A, 100mA Time Delay
- WARTD4100-100: 4 Pole, 100A, 100mA Time Delay
🔧 Key Features:
- Type A residual current detection – covers AC + pulsating DC faults
- 100mA sensitivity with built-in time delay (S-Type functionality)
- Prevents nuisance tripping in upstream devices
- Ideal for use in split-load or distribution boards
- Suited for EV charge points, solar installs, and PME systems
The following chart shows the available 2-pole and 4-pole variants of our 100mA A-Type Time Delay RCDs, including part codes and key dimensions:
What is a time delay RCD used for?
Time delay RCDs (S-type) are used in cascade configurations to prevent multiple devices tripping at once. The upstream RCD trips slightly slower, allowing the downstream device to isolate the fault first.
Is this suitable as a main incomer RCD?
Yes - 100mA delayed RCDs are commonly used as main incomers in boards with additional 30mA protection downstream.
What does Type A mean?
Type A RCDs detect AC faults and pulsating DC leakage, which is critical in modern installations with inverters, EV chargers, and solar gear.
Can I use this in an EV install?
Yes - it’s suitable for EV or solar installs where RCD selectivity and higher fault discrimination is required. Always follow charger manufacturer guidance.
Does it come pre-wired?
No — this is a standalone device and should be installed as part of a compliant consumer unit or distribution board setup.
- Poles: 4
- Sensitivity: 100mA
- Type: A (AC + pulsating DC)
- Time Delay: Yes – Selective (S-type)
- Voltage: 230/400V AC, 50Hz
- Short Circuit Rating: 6kA
- Mechanical Durability: 4000 cycles
- Electrical Durability: 2000 cycles
- Ingress Protection: IP20 (BS EN 60529)
- Temperature Range: -25°C to +40°C
- Recommended Torque: 2.5Nm
- Conformity: BS EN 61008-1
🔍 Variant Dimensions:
- WARTD463-100: 71.5 × 82 × 70 mm
- WARTD480-100: 71.5 × 82 × 70 mm
- WARTD4100-100: 71.5 × 82 × 70 mm
These time-delayed RCDs must be installed by a qualified electrician and are typically positioned upstream in split-load or cascaded RCD configurations. Correct installation helps achieve discrimination between circuits, preventing full-board disconnection on minor faults.
- Ensure compatibility with downstream RCD ratings (typically 30mA)
- Use correct tightening torque on terminals (2.5Nm recommended)
- Install in a ventilated enclosure to maintain IP20 classification
- Match pole count and current rating to system design
