GEN3 RCD4-40A 4 Pole 40A Safety Switch RCD Only 30mA Type A

Description

Three-phase earth-leakage protection for a switchboard.

The GEN3 RCD4-40A is a 4-pole, 40-amp residual current device (RCD) rated 415V, with a 30mA trip and Type A detection. It provides residual-current (earth-leakage) protection only, switching all three active conductors and the neutral when it detects a fault to earth. It is commonly used as a three-phase RCD main switch, protecting a group of downstream circuits, with each of those circuits fitted with its own circuit breaker (MCB) for overload and short-circuit protection.

Key Features

• 4-pole, 40A residual current device (RCD)
• 415V three-phase
• 30mA residual-current trip, Type A
• RCD only – provides earth-leakage protection, not overcurrent protection
• Switches three actives and neutral on an earth fault
• Four module wide (approximately 72mm)
• Suited as a three-phase RCD main switch ahead of separate MCBs
• Body approximately 82 × 72 × 75mm
• Australian/NZ approval or compliance certificates held
• Interchangeable with other major brands

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RCD Only – What That Means

An RCD detects current leaking to earth, for example through a person or a fault, and disconnects the supply quickly to reduce the risk of electric shock. Being RCD only, the RCD4-40A does not provide overcurrent (overload or short-circuit) protection on its own, so it is paired with separate circuit breakers on the circuits it feeds. This differs from an RCBO, which combines RCD and MCB protection in a single device.

A Three-Phase RCD Main Switch

Rated 40A across four poles at 415V, the RCD4-40A is well suited to acting as a residual-current main switch for a three-phase sub-board or group of circuits. It switches all three active conductors and the neutral, and its Type A classification detects both AC and pulsating DC residual currents. The 30mA trip threshold is the standard level used for protection against electric shock on general-purpose circuits.

Q: Does the GEN3 RCD4-40A protect against overload?
A: No. It is an RCD only, providing earth-leakage (residual current) protection. It does not provide overcurrent protection, so it must be used with separate circuit breakers on the downstream circuits.

Q: Is the RCD4-40A for single-phase or three-phase?
A: Three-phase. It is a 4-pole, 415V device, switching three active conductors and the neutral. For single-phase, the 2-pole RCD2-40A is the equivalent.

Q: What does the RCD4-40A switch when it trips?
A: Being 4-pole, it disconnects all three active conductors and the neutral when it detects an earth-leakage fault.