Schneider Electric C2536E250 MicroLogic 6.2 E 250 A Trip Unit

C2536E250: MicroLogic 6.2 E trip unit for ComPacT NSX250

The C2536E250 is not a complete breaker. It is a separate electronic trip unit, a MicroLogic 6.2 E rated 250 A with three protected poles, made by Schneider Electric for ComPacT NSX250 circuit breakers. The datasheet title is: Trip unit MicroLogic 6.2 E for ComPacT NSX 250 circuit breakers, electronic, rating 250A, 3 poles 3d. It is the part that senses the current and decides when the breaker opens, and it adds protection, metering and communication data that simpler trip units lack. Seven Star LLC supplies the C2536E250 in Oman and the GCC as an independent supplier in Muscat.

Ordering the C2536E250 alone makes sense when a unit must be fitted, upgraded or replaced on an NSX250 breaker already in a board. The datasheet states the range compatibility as ComPacT NSX250, so a user with a lower frame size has to verify compatibility with the manufacturer before buying.

Technical data of the C2536E250

Protection settings of the C2536E250: L, S, I and G

The letters LSIG describe four protection stages. Long time (L) protects against overload, with the pick-up Ir selectable from 100 to 250 A and a delay tr adjustable from 15 to 400 s measured at 1.5 x Ir. Short time (S) covers lower-level short circuits, with a pick-up Isd of 1.5 to 10 x Ir and a delay tsd of 0 to 0.4 s, with the I²t function either off or, for delays of 0.1 to 0.4 s, on. Instantaneous (I) trips at once above a pick-up Ii adjustable from 1.5 to 12 x In. Ground fault (G) protects against earth faults, with Ig of 0.2 to 1 x In for ratings above 40 A, switchable on and off, and its own delay tg of 0 to 0.4 s.

Compared with a MicroLogic 2.2, the C2536E250 has adjustable time delays on the short-time stage and a dedicated ground-fault function; the datasheet for the 2.2 lists a fixed short-time delay and no ground-fault protection. The 6.2 E also supports zone selective interlocking (ZSI), which lets protection devices in a chain signal each other so that the device nearest the fault trips first.

Metering and communication in the C2536E250

The E at the end of the name refers to the energy-metering version. The datasheet lists an LCD display and an energy meter as the type of measurement. The data that can be communicated includes energy metering, protection and alarm settings, time-stamped histories and event tables, instantaneous and demand values, maintenance indicators, demand current and power, power quality and maximeters and minimeters. Electrical data recording is given as maintenance indicators.

The datasheet does not describe the communication modules or the protocol used to transport this data; for network integration, the communication accessories and their datasheets must be reviewed separately.

Fitting and commissioning the C2536E250

• Confirm that the target breaker is a ComPacT NSX250, the compatibility the datasheet names, and that the trip unit rating of 250 A matches the circuit design.
• De-energise and isolate before changing any trip unit, following the manufacturer installation sheet.
• Set Ir between 100 and 250 A to the cable and load, then check that Isd, Ii and the ground-fault settings suit the network and the upstream device.
• Switch the ground-fault function on only when the earthing arrangement and coordination study support it.
• Record all dial and menu settings in the panel file, and verify the green ready LED flashes after power-up.
• Test the settings with the manufacturer-approved method before returning the circuit to service.

Where the C2536E250 is used in Oman and the GCC

Electronic trip units with ground-fault protection and metering are typical for main incomers, generator and transformer feeders, and critical distribution in oil and gas, power, water and industrial plants where energy data and selectivity matter. Gulf conditions put heat and dust on the enclosure, and a trip unit is a precision device; the panel should be kept clean and within the temperature limits of the manufacturer. The datasheet gives IP40 and Class II.

C2536E250 compared with other MicroLogic references

Ordering information for the C2536E250

• Part number C2536E250 and quantity.
• Frame size and type of the existing breaker, to confirm NSX250.
• Required Ir range, ground-fault needs and ZSI wiring.
• Whether energy metering and communication will be used.
• Delivery location and documents required.

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.