Schneider Electric C10B3 ComPacT NSX100B 25 kA 3P Basic Frame

C10B3: ComPacT NSX100B 3-pole basic frame without trip unit

The C10B3 is a Schneider Electric ComPacT NSX100B basic frame: a 100 A, three-pole frame without a trip unit, with a breaking-capacity level of B, 25 kA at 415 V AC. The datasheet describes it as a circuit breaker basic frame, 25 kA at 415 V AC 50/60 Hz, 100 A, without trip unit, 3 poles.

Seven Star LLC supplies the C10B3 in Oman and the GCC as an independent supplier based in Muscat.

Technical specifications of the C10B3

Breaking capacity of the C10B3

The datasheet gives ultimate breaking capacity (Icu) and rated service breaking capacity (Ics) at the following voltages under IEC 60947-2.

At 380/415 V the frame is rated at 25 kA for both Icu and Ics, and at 440 V at 20 kA. The datasheet lists Ics at 500 V as 7.5 kA against an Icu of 15 kA, so at that voltage the service capacity is only half the ultimate capacity. This frame suits locations where the prospective fault current is modest.

What a basic frame is and what it needs

A basic frame is the molded body, contacts and operating mechanism of a ComPacT NSX breaker without the protection element. The datasheet calls the product a basic frame and shows no trip unit, so the C10B3 gives no overload or short-circuit protection until a trip unit is fitted. This is the way the NSX family allows one frame to be configured with different trip units: thermal-magnetic units for simple duty, or electronic MicroLogic units for adjustable and metered protection.

A frame ordered alone is therefore a part of a build. Before ordering, decide which trip unit will be used, and check with the manufacturer’s documentation that the trip unit reference is listed for NSX100 frames. The rated current of the finished breaker is set by the trip unit’s rating, up to the 100 A of the frame.

Dimensions, mounting and connection of the C10B3

The frame is 105 mm wide, 161 mm high and 86 mm deep, mounts fixed on a backplate and has front connections at the top and bottom on a 35 mm pitch. The control is a toggle. The datasheet lists utilisation category A, which means it is not designed for deliberate short-time delay to achieve selectivity under short-circuit conditions; for that, a category B device from a larger family is the usual choice.

The front face is Class II and the degree of protection is IP40 with IK07 impact rating, which is sufficient for installation inside an enclosed panel but not for an open location.

Related NSX references

Within the NSX100 group that Seven Star LLC handles, the 25 kA basic frame C10B3 and the 36 kA basic frame C10F3 share the same outline. The F-level frame C10F3 offers 36 kA at 415 V in the same outline and is the alternative where the fault level rises above 25 kA. Complete NSX100F breakers with thermal-magnetic TM-D trip units, such as C10F1TM020 and C10F1TM030 in single-pole form, are built on a different, narrower frame body and are single-pole devices.

Installation and maintenance of the C10B3

The sequence is to mount the frame, fit and lock the trip unit according to the manufacturer’s instructions, connect and torque the conductors, and then set and record the trip settings. Because the C10B3 is delivered without a trip unit, make sure that the label on the finished breaker carries the trip unit rating, so that anyone inspecting the board can read it.

Mechanical durability of 50000 cycles is high for this size, and electrical durability is 10000 cycles at 690 V In and 30000 cycles at 440 V In. In practice, operating counts are low on distribution feeders, so maintenance is mostly a periodic inspection of terminals for heat discolouration, a manual open and close test and a check of the trip unit’s function.

Where it is used in Oman and the GCC

A 100 A NSX frame is typical for feeders to small motors, lighting and small-power boards, air-conditioning plant, workshop supplies and sub-distribution panels in commercial and industrial buildings across Oman and the GCC. The wide ambient range stated in the datasheet is helpful in hot switchrooms, but a sealed, ventilated enclosure remains the best protection against dust and humidity.

Selection and RFQ information for the C10B3

• Fault level at the board against the Icu column for the system voltage.
• Trip unit: thermal-magnetic or electronic, and the current rating required.
• Standards: IEC 60947-2 listed for this frame; check whether the project also requires another standard.
• Accessories: auxiliary contacts, release coils, rotary handle, terminals.
• Quantity and delivery location.

Please send the part number C10B3, the quantity, the trip unit you plan to fit, the system voltage and prospective fault current, and the delivery location in Oman or the GCC.

Documents and quotation

The official English datasheet for the C10B3 is attached on this page. It lists the breaking capacity, durability, dimensions and environmental data used above.

To request a quotation, send the part number C10B3, the quantity and the delivery location. Seven Star LLC is an independent supplier in Muscat and quotes according to current availability.