Hager ADM420T 20A 4 Pole (3P+N) RCBO Safety Switch 6kA C Curve 30mA Type A 230-415V AC 4 Module DIN Rail

Description

20A earth leakage and overcurrent protection, 4 poles.

Hager's ADM420T packs a 20A C curve circuit breaker and a 30mA Type A safety switch into one 4 module RCBO. Each three-phase circuit gets its own dedicated earth leakage protection, so a single fault trips only the affected circuit instead of a shared RCD group.

Key Features

• Current rating: 20A, C tripping curve
• Earth leakage sensitivity: 30mA, Type A
• Pole configuration: 3P+N with all 4 poles protected
• Short-circuit rating: 6kA Icn / 6kA Ics (IEC 60898-1)
• Operating voltage: 230-415V AC, 50Hz
• Footprint: 4 DIN modules, 71 x 84 x 70mm (W x H x D)
• Neutral on the right-hand side
• Screw top terminal, biconnect bottom terminal
• I²t energy limitation class 3, IP2X

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What the ADM420T Brings to Your Switchboard

Breaker and safety switch combined
An RCBO merges the job of a miniature circuit breaker (MCB) with that of a residual current device (RCD). The ADM420T disconnects its circuit when current exceeds its 20A rating for too long, when a short-circuit occurs, or when leakage to earth reaches 30mA. Hager specifies it for 3-phase or single-phase systems within its 230-415V AC operating range.

Why Type A and curve C
A Type A residual current element detects both sinusoidal AC and pulsating DC earth fault currents. The C curve tolerates the brief inrush that occurs when mixed or moderately inductive loads switch on, helping reduce nuisance tripping. Energy limitation class 3 means the device restricts the let-through energy during a short-circuit.

Specifying and fitting notes

• At 30°C the full 20A applies; this falls to 19.1A at 40°C and 17.2A at 60°C.
• Multiply the rating by 0.80 where two devices sit side by side.
• Cable range: 1-16mm² flexible, 1-25mm² solid, with terminals torqued to 2Nm.
• Power dissipation is 11.7W at rated current, worth factoring into enclosure heat calculations.
• Must be installed by a licensed electrician to AS/NZS 3000.

Q: Can the Hager ADM420T be used on a single-phase supply?
A: Hager states the ADM420T suits 3-phase or single-phase systems, with a rated operational voltage of 230-415V AC.

Q: How much current can the Hager ADM420T carry at 40°C?
A: Hager rates it at 19.1A at 40°C ambient, compared with its full 20A rating at 30°C.

Q: What cable sizes fit the Hager ADM420T terminals?
A: The screw terminals take flexible conductors from 1 to 16mm² and solid conductors from 1 to 25mm².