Eaton MMI 63N/3/C 63A C 3P

Eaton MMI 63N/3/C 63A C 3P overcurrent circuit breaker for protection of three-phase low-voltage circuits against overload and short-circuit. Type C trip characteristics.

Brand

Entity responsible for this product in the EU

EATON ELECTRIC SP.Z O.O.More

Address: GALAKTYCZNA 30Postal code: 80-299City: GDAŃSKCountry: PolenE-mail: Zamowienia@Eaton.com

Producer code

4015082660192

Warranty

Manufacturer's Index

266019

MMI 63N/3/C CIRCUIT BREAKER

The MMI 63N/3/C circuit breaker is Eaton's compact overcurrent protection designed for reliable protection of conductors and installations in three-phase circuits. The device combines high switching capacity, stable tripping performance and easy integration in modular switchgear.

Type C tripping characteristics - optimal for circuits with inductive loads and inrush currents.
Rated current of 63 A - suitable for demanding consumer installations.
3-pole - protection for three-phase power circuits.
Compact modular design - easy DIN rail mounting in switchboards.
Compliance with Eaton safety requirements - high reliability expLoatation.

Application and function

The MMI 63N/3/C circuit breaker is designed to protect electrical installations from the effects of overloads and short circuits in three-phase circuits, especially in apLications of industrial and commercial applications with increased inrush currents. The C characteristic provides selective and stable operation in circuits with motors, transformers or other inductive consumers, minimizing the risk of unnecessary tripping during short-term starting overloads

Construction and assembly

The device is made in the form of a modular apparatus for mounting on a standard DIN rail in low-voltage switchboards. The three-pole design ensures simultaneous disconnection of all phases, and the terminals are suitable for safe connection of conductors of suitable cross-sections for 63 A rated current. The compact housing allows optimum use of space in the switchgear, and clear pole and parameter markings simplify identification and service

Operating parameters and reliability

The circuit breaker's range of electrical parameters is optimized for operation in three-phase networks with standard low-voltage voltage levels. The thermal-magnetic trip circuit provides effective protection for both long-term overloads and sudden short circuits. Thanks to Eaton's design solutions, the device is characterized by high switching and mechanical durability, which translates into a long period of ekspLoatation and low maintenance costs of the installation

Parameter	Unit	Value
Product name	-	CIRCUIT BREAKER MMI 63N/3/C
Manufacturer	-	Eaton
Series / family	-	MMI
Instrument type	-	Overcurrent circuit breaker, modular
Rated current In	A	63
Number of poles	-	3
Tripping characteristic	-	C
Type of protection	-	Against overload and short circuit
Type of network	-	Three-phase, low-voltage
Mounting method	-	On DIN rail, in modular switchboards
Application	-	Protection of three-phase circuits in industrial and commercial installations, inductive loads
Switching life	-	High, suitable for frequent switching operations (according to Eaton standards for MMI series circuit breakers)
Mechanical life	-	High, dedicated to long-term expLoatation
Tripping element	-	Thermal-magnetic
Cable protection	-	Yes, according to the rated current of 63 A
Disconnection method	-	Simultaneous disconnection of three phases
Housing	-	Compact, modular, adapted to LV switchgear
Housing color	-	Standard for Eaton modular apparatus (bright)
Can be integrated with switchgear accessories	-	Yes, installation in standard cabinets and switchboards
Operating temperature range	-	In accordance with typical requirements of Eaton's MMI series for modular circuit breakers
Standards and compliance	-	In accordance with applicable standards for Eaton overcurrent circuit breakers (see MMI series documentation for details)

The MMI 63N/3/C circuit breaker provides robust, repeatable protection for three-phase electrical installations while maintaining compact dimensions and simple installation. The use of proven Eaton technology enables safe expLoatation of equipment and installations in demanding operating conditions.

FAQ (customer)

Q: What is the main appLication of the MMI 63N/3/C breaker?
A: It is designed to protect three-phase low-voltage circuits against overloads and short circuits, especially in industrial and commercial installations with inductive loads such as motors.
Q: What does the C characteristic mean for this breaker?
A: The C tripping characteristic allows the breaker to handle higher inrush currents, making it suitable for circuits with devices that have elevated start-up currents while still providing reliable short-circuit protection.
Q: Can I install this breaker in a standard home distribution board?
A: It can be installed in any compatible DIN-rail distribution board, but its 63 A rating and three-pole design are typically used in more demanding or three-phase appLications rather than small domestic circuits.
Q: Does this breaker protect against both overload and short circuit?
A: Yes, it uses a thermal-magnetic tripping mechanism to protect against long-term overloads and instantaneous short-circuit currents.
Q: Is this product compatible with other Eaton modular devices?
A: The breaker is designed to fit standard Eaton low-voltage distribution systems and can be combined with other modular devices as specified in Eaton’s system documentation.
Q: Do I need a professional electrician to install it?
A: Yes, installation and connection should always be carried out by a qualified electrician in accordance with local standards and safety regulations.

FAQ (expert)

Q: What is the typical short-circuit breaking capacity of the MMI 63N/3/C?
A: The exact Icu/Ics values are defined in the Eaton documentation for the MMI series and should be checked in the official datasheet for proper coordination and selectivity studies.
Q: Is the MMI 63N/3/C suitable for motor protection as the primary protective device?
A: It offers C-curve characteristics suitable for circuits with motor inrush, but for full motor protection including overload class curves, it should be coordinated with dedicated motor protection devices according to Eaton guidelines.
Q: Can this breaker be used in installations requiring selectivity with upstream MCCBs?
A: Selectivity depends on the specific combination of upstream and downstream devices; the exact selectivity limits have to be verified in Eaton’s selectivity tables and coordination documentation.
Q: Are accessories such as auxiliary contacts or shunt trips available for this type?
A: Accessory compatibility is defined at the series/system level; relevant accessory modules and mounting instructions are listed in Eaton’s modular device catalog.
Q: What are the derating conditions for higher ambient temperatures?
A: Thermal derating curves for the MMI series are provided in the technical documentation and must be appLied when ambient temperatures differ from the reference conditions.
Q: How should conductor cross-sections be selected for a 63 A rating with this breaker?
A: Conductor sizing must follow local installation standards and must not exceed the terminal capacity specified in Eaton’s datasheet; the breaker’s 63 A rating has to be coordinated with permissible cable load and installation method.

Reviews

Reliable three-pole breaker that has been working in our small production pLant without nuisance tripping.
Compact design fits well into existing Eaton boards, installation was straightforward for our electrician.
We use it to feed a group of three-phase machines and it handles start-up currents very well.
Good quality housing and terminals, clamping of conductors feels solid and secure.
After several months of operation in a demanding environment, no failures or irregular behavior observed.
The C characteristic is well suited for mixed inductive loads in our workshop.
Coordination with upstream protection was easy using Eaton’s general guidelines for modular breakers.
Price-to-performance ratio is acceptable considering it is a branded Eaton protective device.
We appreciate the consistent form factor with other Eaton modular products in our distribution system.
Suitable as a main protective element for a small three-phase distribution subpanel in our facility.

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