Schneider Electric C10N1TM020 NSX100N 1P 20 A AC/DC Breaker

C10N1TM020: one-pole 20 A ComPacT NSX100N for AC and DC circuits

The C10N1TM020 is a Schneider Electric ComPacT NSX circuit breaker listed in its datasheet as: Circuit breaker ComPacT NSX100N AC/DC, 25kA at 240VAC, TMD trip unit 20A, 1 pole 1d. It is the narrowest and lowest-rated member of the one-pole NSX100N group, only 35 mm wide, and it carries a thermal-magnetic trip unit rather than an electronic one. Seven Star LLC supplies the C10N1TM020 in Oman and the GCC as an independent supplier based in Muscat.

The reference breaks down as follows. C10 is the NSX100 frame, N is the breaking-capacity class (the datasheet code reads N 25 kA 240 V AC), 1 means one pole, TM is thermal-magnetic and 020 is the 20 A rating. The datasheet device short name is NSX100N, the poles description is 1P with one protected pole (1D), and the trip unit is a TM-D. This page describes only what the datasheet states for the C10N1TM020; it does not describe other ratings of the family except where noted.

Technical specifications of the C10N1TM020

AC and DC ratings of the C10N1TM020 in plain terms

Most one-pole breakers are single-purpose, but the C10N1TM020 is rated for both supply types. On alternating current the datasheet gives 277 V AC at 50/60 Hz with an Icu of 25 kA at 220/240 V AC. On direct current it gives 250 V DC with an Icu of 50 kA. The Ics (service breaking capacity) values equal the Icu values for both cases: 25 kA on AC and 50 kA on DC.

The DC rating applies to the single pole at 250 V DC, so a design needing more than 250 V DC across a break, or AC above 277 V per pole, has to be checked against the manufacturer documentation.

The practical consequence is that selection happens at the order stage. A load with a high inrush (small motors, transformers, discharge lighting banks) should be checked against the 190 A threshold, because an inrush peak above it would open the breaker instantly. A load with a steady current close to 20 A should also be reviewed for ambient temperature, since the rating is stated at 40 °C.

Where the C10N1TM020 differs from its sibling ratings

The one-pole NSX100N group also includes other ratings, such as the C10N1TM063, which is the highest rating treated here: its datasheet gives 63 A, an instantaneous pick-up of 500 A and a dissipation of 8.61 W per pole, while the C10N1TM020 shows 20 A, 190 A and 4.01 W per pole. Dimensions and weight are the same in both datasheets, so the choice between them changes the protection level and the heat inside the enclosure, not the panel cut-out.

Selection checklist before ordering the C10N1TM020

• Circuit voltage: not above 277 V AC or 250 V DC per pole, with the fault level at the point of installation not above the 25 kA (AC) or 50 kA (DC) Icu.
• Load current: a continuous current that stays at or below 20 A at 40 °C panel temperature, with margin for the actual enclosure conditions.
• Inrush: confirm that the starting or switching peak stays below the fixed 190 A instantaneous setting.
• Isolation: the datasheet confirms suitability for isolation under EN/IEC 60947-2, Category A, which matters for maintenance procedures.
• Poles: one protected pole (1D). Where all conductors must be broken, a multi-pole NSX breaker is needed instead.
• Altitude: full rating up to 2000 m; derating applies from 2000 m to 5000 m.

Mounting, wiring and maintenance of the C10N1TM020

The C10N1TM020 is a fixed breaker mounted on a backplate, horizontally, vertically or flat on its back. Connections are made at the front on both the upside and the downside, on a 35 mm connection pitch. The toggle control gives a visible handle position, and the datasheet places the front face in Class II for electrical shock protection with IP40 and IK07 protection degrees. IP40 protects against solid objects over 1 mm but not against water, so the breaker belongs inside a suitable enclosure when used in dusty or damp locations.

For maintenance, the mechanical durability is 20000 cycles and the electrical durability is 20000 cycles at 277 V and half of In, or 10000 cycles at 277 V and full In. These figures help planners decide how often a breaker used as a frequent switching device should be reviewed. After any fault trip, inspect conductors and terminations before resetting. Keep the datasheet with the panel records.

Typical applications of the C10N1TM020 in Oman and the GCC

Single-pole AC/DC breakers of this size find use in compact distribution boards, DC auxiliary supplies such as battery and rectifier circuits at 250 V DC, telecom and control cabinets, and small-load feeders in utility, oil and gas and water treatment plants. In the Gulf climate the main practical points are heat inside a closed enclosure and fine dust. The dissipation of 4.01 W per pole is small, but it adds up when several breakers sit side by side in a cabinet in direct sun. Humidity up to 95 % is stated in the datasheet, and the enclosure should still be sealed against condensation and dust during commissioning.

Information to send with an RFQ for the C10N1TM020

• The full part number C10N1TM020 and the quantity.
• System voltage and type (AC or DC) and the available fault current.
• Load description and expected inrush.
• Enclosure type, ambient temperature and altitude.
• Required delivery location and any documents needed with the shipment.

Documents and quotation

A datasheet for this product is attached on this page. It lists the electrical, mechanical and environmental data summarised above, and it is the document to check against your own drawings.

Send us the part number, quantity and application and we will confirm availability and a quotation. Seven Star LLC is an independent supplier in Muscat and is not affiliated with the manufacturer.