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The Heinemann SFM1-G3-16-2 is a 16A single-pole circuit breaker from the CBI SFM series, rated 240V AC with a 6kA interrupting capacity. The SFM1-G3-16-2 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 contracts as the switchboard warms. The second cost materialises after operation, because the bimetallic mechanism must cool before the breaker will reset. That commits an electrician to waiting at the board while a component returns to temperature. The SFM1-G3-16-2 eliminates both. It maintains 100% rating capability independent of ambient temperature, and it can be switched on immediately after tripping.
Two figures warrant confirmation before this breaker reaches the board. The SFM frame measures 26mm per pole, rather than the 18mm of a standard DIN module, so each pole occupies approximately 1.4 modules and the board layout must accommodate the difference. The G in the part number designates box terminals, and CBI rates those at 1 to 35mm2. The 50mm2 figure belongs to the lug and rear stud variants instead.
The SFM1-G3-16-2 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 a temperature compensation curve, available on request. Endurance is rated at 500 mechanical operations to AS/NZS 3111 Clause 7.7.
(SFM1-G3-16-2)
26mm per pole. CBI designates the frame SFM(26) and the outline drawing confirms 25.8mm. That is wider than the 18mm standard DIN module, so each SFM pole occupies roughly 1.4 modules of board space. Allow for it when laying out a row rather than assuming standard module pitch.
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.
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.
-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, 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 separately 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.
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.
Sparky Direct stocks the single-pole range as the SFM1-G3 series from 10A to 63A, including the SFM1-G3-10-2, SFM1-G3-20-2, SFM1-G3-25-2, SFM1-G3-32-2, SFM1-G3-40-2, SFM1-G3-50-2 and SFM1-G3-63-2. Three-pole equivalents run as the SFM3-G3 series at 415V. CBI also lists a handle lock (4474005) and safety blanks.
The Heinemann SFM1-G3-16-2 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 | SFM1-G3-16-2 |
| Model # | SFM1-G3-16-2 |
| Package Weight | 0.219kg |
| TYPE | VALUE |
|---|---|
| Type | Circuit Protection |
| Brand | HEINEMANN |
| Colour | White |
| Rated Current (A) | 16 |
| Height (mm) | 150 |
| Width (mm) | 26 |
| Depth (mm) | 85 |
| Mounting | Clip Tray, Front or Surface |
| Voltage (V) | 240V |
| Number of Poles | 1 |
| Overcurrent trip characteristic | Curve 2 (c) |
| Breaking Capacity | 6kA |
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$78.31 $71.19 ex. GST
$78.31 $71.19 ex. GST
$78.31 $71.19 ex. GST
$78.31 $71.19 ex. GST
