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The Hager HMC280T is a two-pole miniature circuit breaker rated 80 A, with a C tripping curve for modular switchboards. The HMC280T has a short-circuit breaking capacity of 15 kA under both IEC 60898-1 and IEC 60947-2. Rated operational voltage is 400 to 415 V AC at 50 to 60 Hz, with IP20 protection. The breaker takes up three modules of DIN rail width.
An 80 A feed carries far more load than a lighting or general power circuit, and it lands on heavier cable. Boards with a high prospective fault current need a device that can interrupt that fault and stay serviceable. The HMC280T is rated to a 15 kA breaking capacity, with screw terminals that accept 70 mm2 rigid conductors direct. Its C curve rides through the starting inrush of motors and transformers instead of tripping on it.
Three modules of rail width is the figure to plan around when an 80 A two-pole device goes into a board. The screw terminals are aligned top and bottom, so incoming and outgoing conductors run straight through the enclosure. Terminal torque is specified at 3.5 to 5.0 Nm, which takes the guesswork out of fit-off. Mounting is possible in any orientation, so upright and inverted rail runs both work.
The HMC280T is rated IP20, so it is not suitable for outdoor mounting or for damp exposed positions. It has to be installed inside a switchboard or enclosure that provides the ingress protection the location calls for. Ambient temperature is also limited: the operating range is -25 to 70 degrees C, and the 80 A rating falls away as ambient temperature climbs.
(HMC280T)
The Hager HMC280T is a two-pole miniature circuit breaker rated 80 A with a C tripping curve. It has a 15 kA short-circuit breaking capacity, mounts on DIN rail, and takes up three modules of board width. Rated operational voltage is 400 to 415 V AC.
The HMC280T protects 80 A circuits in a switchboard, typically a sub-main run out to a distribution board, or a heavy final subcircuit. The C curve suits inductive loads such as motors, pumps and transformers. The 15 kA rating covers board positions where prospective fault current runs high.
Installing and connecting a switchboard circuit breaker is licensed electrical work in Australia. The HMC280T clips onto standard DIN rail and takes three modules of rail space. Screw terminals sit at the top and bottom, torqued to 3.5 to 5.0 Nm.
A C curve breaker rides through the short inrush current that inductive loads draw at start-up, rather than tripping on it. That suits motors, transformers, pumps and switchmode power supplies. Hager also lists a D curve version, the HMD280T, for loads with an even heavier starting surge.
The kA figure is the short-circuit current the breaker can safely interrupt. At 15 kA, the HMC280T suits boards closer to the supply where prospective fault current is higher than a 10 kA device can handle. The 10 kA equivalent in the Hager range is the HMF280T.
Screw terminals accept rigid conductors from 1 to 70 mm2 and flexible conductors from 1 to 50 mm2, on both the input and output sides. Terminals are aligned top and bottom. Tighten to the specified 3.5 to 5.0 Nm.
The rating is temperature-dependent. It carries 80 A at 30 degrees C, 75.10 A at 40 degrees C, 70 A at 50 degrees C and 64.30 A at 60 degrees C. Power dissipation at rated current is 11.98 W, which adds heat inside the enclosure.
The Hager HMC280T is available online from Sparky Direct, with Australia-wide delivery to any state or territory including regional areas. Sparky Direct is an Australian electrical wholesaler established in 2005, supplying more than 500,000 customers with transparent trade pricing.
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These specifications and characteristics outline physical, mechanical, electrical details.
| Brand | Hager Electrical |
| SKU | HMC280T |
| Model # | HMC280T |
| Barcode # | 3250613231248 |
| Package Weight | 0.470kg |
| TYPE | VALUE |
|---|---|
| Type | Circuit Protection |
| Brand | Hager Electrical |
| Rated Current (A) | 80 |
| Height (mm) | 90 |
| Width (mm) | 53 |
| Depth (mm) | 70 |
| Protection | C Curve |
| Mounting | DIN rail |
| Voltage (V) | 400-415 |
| Number of Poles | 2 |
| Breaking Capacity (kA) | 15 |
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