Schneider Electric EZ9F51163 Easy9 1P 63 A C-curve MCB

EZ9F51163: Easy9 1P 63 A C-curve miniature circuit breaker

The EZ9F51163 is a Schneider Electric Easy9 miniature circuit breaker with single-pole construction, a 63 A rated current and a C trip curve. It uses thermal-magnetic tripping, clips onto a DIN rail and is rated for AC networks. Seven Star LLC supplies the EZ9F51163 in Oman and the GCC as an independent supplier based in Muscat.

Reading the reference from the product title: 1P is the pole count, 63 A is the rated current [In], C is the curve code, and the series title states the breaking capacity and voltage class. It switches the phase conductor only, so it is intended for a single-phase branch where the neutral is carried separately. This sits in the higher breaking-capacity group of the series, with 10000 A listed at both 230 V and 400 V, and a DC rating of 5000 A at 60 V on this single-pole version.

Typical uses of the EZ9F51163 in Oman and the GCC

A 63 A 1P breaker like this unit commonly appears in site offices and camp facilities, air-conditioning and water-heater circuits and shop fit-outs and retail units. Gulf installations see long summer peaks, so cooling loads and ambient heat in rooftop or outdoor enclosures deserve attention when choosing the rating. Dust and humidity make a clean, closed enclosure important, because the breaker itself is IP20. The datasheet lists tropicalisation level 2 and humidity up to 95 % at -5 to 60 °C, which is useful context for coastal sites but not a substitute for proper enclosure selection.

Technical specifications of the EZ9F51163

Size, terminals and mounting of the EZ9F51163

The EZ9F51163 is 18 mm wide, 81 mm high and 66.5 mm deep, which equals 2 modules of 9 mm. It clips on a DIN rail and its toggle shows the contact position. Terminals are tunnel type, top or bottom, with Tunnel type terminal (top or bottom) 1–25 mm² flexible; Tunnel type terminal (top or bottom) 1–35 mm² rigid. The tightening torque is 3.5 N.m, and a calibrated screwdriver avoids both loose and crushed conductors.

At 2 modules it is the narrowest Easy9 body in this group, so it is the usual choice when many circuits must fit in a compact consumer unit. Ambient limits are -5 to 60 °C in operation and IP20 applies to the front of the breaker, so the enclosure supplies the wider protection.

Selection checklist for the EZ9F51163

• Cable and load: the circuit conductor must be sized for 63 A with the installation method and ambient temperature considered.
• Poles: 1P suits a phase-only single-phase branch.
• Fault level: compare 10000 A Icn at 230 V AC 50/60 Hz; 10000 A Icn at 400 V AC 50/60 Hz; 5000 A Icn at 60 V DC with the prospective short-circuit current.
• Load type: a C curve fits moderate inrush; very high inrush may need a different characteristic.
• Board space: 2 modules and 18 mm of rail.
• Back-up: confirm whether upstream protection is required for coordination with your breakers.

Installation and maintenance of the EZ9F51163

Isolate the board before work, clip the EZ9F51163 onto the DIN rail and make sure the toggle moves freely. Strip conductors to the length the terminal needs, insert them fully and tighten to 3.5 N.m. This unit accepts the cross-sections listed above, so avoid forcing larger cable or using ferrules that do not fit. After energising, operate the toggle once to check the contact position indicator, then label the circuit.

Periodically re-torque terminals in boards that see vibration or large temperature swings, and look for discoloured plastic, which indicates heat at a termination. A breaker that has tripped on a short circuit should be investigated before it is reset, and one that trips repeatedly on a normal load points to an undersized rating, not a faulty device.

How the EZ9F51163 compares with sibling references

These nearby Easy9 C-curve references from the same group show how rating, width and trip band move together. The pole count and the breaking-capacity group are the real differences; the amp rating changes the magnetic range and, at the top end, the terminal torque.

Information to send with an RFQ for the EZ9F51163

• Exact reference EZ9F51163 and the quantity needed.
• Supply voltage, system type and earthing arrangement.
• Prospective short-circuit current at the board, if known.
• Load description and cable size for the circuit.
• Any companion devices needed in the same order, such as other pole counts or ratings.
• Delivery location and project timeline.

Before ordering, also check that the board enclosure, busbar arrangement and neighbouring breakers leave enough spacing for heat to dissipate, since crowded boards in hot rooms run closer to their limits than the rated ambient suggests.

Documents and quotation

The manufacturer datasheet for the EZ9F51163 is attached on this page and holds the full specification summarised above.

Send us the reference EZ9F51163, quantity and delivery location and Seven Star LLC will reply to your request. We supply as an independent supplier based in Muscat.