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The Heinemann SFM3-G3-10-2 is a 10A three-pole circuit breaker from the CBI SFM series, rated 415V AC with a 6kA interrupting capacity. The SFM3-G3-10-2 uses hydraulic-magnetic technology, which delivers 100% rating capability independent of ambient temperature. It is approved to AS/NZS 3111 under approval number N15215, carries the Curve 2 medium time delay identified by its white handle, and operates from -40 to +85 degrees.
A thermal magnetic breaker interprets ambient temperature as though it were load current, so its usable rating shrinks as the switchboard warms. The second cost arrives after it operates: the bimetallic strip must cool before the breaker will reset, which leaves an electrician standing at the board waiting for a component to reach temperature. The SFM3-G3-10-2 eliminates both. It holds 100% rating capability independent of ambient temperature, and it can be switched on immediately after tripping.
The operating envelope explains where CBI positions the series. -40 to +85 degrees ambient, 50g shock at an 11 millisecond pulse, and 5g vibration from 35Hz to 200Hz are railway and mining figures rather than switchboard figures. Flammability I3, toxicity F1 and pollution degree PD2 complete the same picture. The SFM3-G3-10-2 is a 10A breaker built to a specification that survives a locomotive, which is why it appears in telecom, UPS and mobile generation cabinets.
The SFM3-G3-10-2 provides overcurrent protection only and does not provide earth leakage protection. The shunt trip option carries no approvals, which matters where every component in the board must be approved. The temperature claim also has a precise scope. CBI publishes the curves at 30 degrees with the breaker upright, and states the must-hold, must-trip and instantaneous trip values are not affected by temperature. Delay times at other operating currents may need adjustment against a temperature compensation curve, available on request. Endurance is rated at 500 mechanical operations to AS/NZS 3111 Clause 7.7.
(SFM3-G3-10-2)
A thermal magnetic breaker trips on a bimetallic strip that responds to heat, so ambient temperature affects its usable rating. A hydraulic-magnetic breaker uses a magnetic and hydraulic mechanism. CBI rates the SFM series at 100% rating capability independent of ambient temperature, and the breaker can be switched on immediately after tripping with no cooling period.
Box terminals take 1mm2 to 35mm2 at 4Nm torque. The G in the part number denotes box terminals, so that is the figure for this SKU. CBI's lug and rear stud terminal variants take 1mm2 to 50mm2 instead. Confirm the terminal type against the part number before sizing the termination.
-40 to +85 degrees ambient. The temperature-independence claim has a precise scope. CBI publishes the trip curves at 30 degrees with the breaker upright, and states the must-hold, must-trip and instantaneous trip values are not affected by temperature. Delay times at other operating currents may need a temperature compensation curve, available from CBI on request.
AS/NZS 3111, under approval number N15215. Interrupting capacity is 6kA at 415V AC, with 2kV dielectric strength to AS/NZS 3111 Clause 7.5.2 and endurance rated at 500 mechanical operations to Clause 7.7. The optional auxiliary switch is approved to DIN/EN 60947-3 and AS/NZS 3111.
Both are options rather than standard fittings. The auxiliary switch is a single pole double throw unit rated 15A at 250V AC, fitted to the left of the first pole. The shunt trip mounts to the left of the unit. CBI states the shunt trip option carries no approvals, which matters on boards requiring approved components throughout.
Curve 2 is CBI's medium time delay, identified by the white handle. The series also offers Curve 1 long delay with an orange handle, and Curve 3 short delay which also uses white. This is CBI's own nomenclature rather than the B, C and D system, so confirm discrimination against the published curve data.
No. Pole construction code 3 in the part number denotes an overload series trip, so the breaker provides overcurrent protection only. Earth leakage protection requires a separate device. The IP2X figure also covers the terminals rather than the device, so the breaker still needs an enclosure suited to its position.
CBI lists a handle lock (part 4474005), a single-pole safety blank (SFM1BLANK), a two-pole safety blank (SFM2BLANK), and an escutcheon blank (SFEB000). Sparky Direct stocks the three-pole range as the SFM3-G3 series from 10A to 63A, with single-pole equivalents in the SFM1-G3 series.
The Heinemann SFM3-G3-10-2 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 | Heinemann |
| SKU | SFM3-G3-10-2 |
| Model # | SFM3-G3-10-2 |
| Barcode # | 6009522904715 |
| Package Weight | 0.783kg |
| TYPE | VALUE |
|---|---|
| Type | Circuit Breaker |
| Colour | White |
| Rated Current (A) | 10 |
| Protection | Curve 2 (Medium) |
| Mounting | Clip Tray, Front or Surface |
| Voltage (V) | 415 |
| Number of Poles | 3 |
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