Specifications
Electronic trip insulated case circuit breakers have a molded case made of a glass-reinforced insulating material that provides high dielectric strength. These circuit breakers
meet the requirements of NEC Section 240-6 by providing a means to seal the rating plug and trip unit adjustments
are equipped with an externally accessible test port for use with a universal test set
Circuit Breaker Ratings
Voltage Ratings
Voltage ratings indicate the maximum voltage for the electrical system on which the circuit breaker can be applied. All Square D electronic trip insulated case circuit breakers are designed to be applied on systems rated 600 Vac or less. They are not designed for use on dc systems.
Continuous Current Rating
The continuous current rating of an electronic trip circuit breaker is determined by the mathematical equation:
The circuit breaker ampere rating (P) is found by multiplying the circuit breaker sensor size by the rating plug multiplier.
The long-time pickup switch varies the circuit breaker con-tinuous current rating as a multiple of the ampere rating. Switch positions are adjustable from 0.5 to 1.0.
Frequency Rating
Electronic trip circuit breakers are recommended for applications only on systems at 50/60 Hz. These circuit breakers have not been evaluated at any other frequency.
Interrupting Rating
The interrupting rating is the highest current at rated voltage the circuit breaker is designed to safely interrupt under standard test conditions. Circuit breakers must be selected with interrupting ratings equal to or greater than the available short-circuit current at the point where the circuit breaker is applied in the system (unless it is a branch device in a series rated combination). Interrupting ratings are shown on the faceplate of the circuit breaker.
General
Square D electronic trip insulated case circuit breakers are equipped with the MICROLOGIC Full-function Trip System. This trip system provides adjustable tripping functions and charac-teristics using true root-mean-square (rms) current sensing.
MICROLOGIC trip systems use a set of current transformers (called CTs or sensors) to sense current, a full-function trip unit to evaluate the current, and a tripping solenoid to trip the circuit breaker. Adjustable rotary switches on the trip unit allow the user to set the proper overcurrent or ground current protection required in the electrical system. If current exceeds a set value for longer than its set time delay, the trip system opens the circuit breaker.
Circuit breakers are shipped with the long-time pickup switch
set at 1.0 and all other trip unit adjustments set at their lowest
settings. Actual settings required for a specific application must
be determined by a qualified consultant or plant engineer. A
coordination study is recommended to provide coordination
between all circuit breakers in the distribution system.
Introduction
MASTERPACT ® NW low-voltage power circuit breakers are designed to protect electrical systems from damage caused by overloads, short circuits and ground faults. All MASTERPACT circuit breakers are designed to open and close a circuit manually, and to open the circuit automatically at a predetermined overcurrent setting. MASTERPACT low-voltage power circuit breakers can also:
Provide zone-selective interlocking (ZSI) which can reduce damage in the event of a fault
Codes and Standards
MASTERPACT NW low-voltage power circuit breakers are manufactured and tested in accordance with the following standards:
Circuit breakers are applied according to guidelines detailed in the National Electrical Code ® (NEC ® ) and other local wiring codes.
Features and Benefits
High Ampere Interrupting Rating (AIR)
MASTERPACT circuit breakers have an interrupting rating of 200,000 A at 508 Vac without fuses.
High Short-time Current Rating
MASTERPACT circuit breakers have exceptional short-time ratings of 85,000 A in a 3200 A frame and 100,000 A in a 4000 A frame.
100% Rated Circuit Breaker
MASTERPACT circuit breakers are designed for continuous operation at 100% of their current rating.
True Two-step Stored Energy Mechanism
MASTERPACT circuit breakers are operated via a stored-energy mechanism which can be manually or motor charged. The closing time is less than five cycles. Closing and opening operations can be initiated by remote control or by push buttons on the circuit breaker front cover. An O–C–O cycle is possible without recharging.
Field-installable Trip Units, Sensor Plugs and Accessories
Trip units, sensor plugs and most accessories are field installable with only the aid of a screwdriver and without adjusting the circuit breaker. The uniform design of the circuit breaker line allows these accessories to be common for the whole line.
Reinforced Insulation
Two insulation barriers separate the front of the circuit breaker from the current path.
Tropicalization
The standard moisture and fungus protection ensure normal operation under
extreme ambient conditions. MASTERPACT circuit breakers comply with T2
tropicalization (IEC Standard 68-2-30); relative humidity 95% at 113°F (45°C)
and 80% at 131°F (55°C) hot, humid climate. Salt spray resistance as per IEC
68-2-11.
General characteristics
Compliance with standards
Compliance with North American standards
COMPACT® NS circuit breakers are built in accordance with Underwriters Laboratories Inc. UL 489 Standard and Canadian Standards Association CSA C22.2 No.5.1 Standard. Circuit breakers, switches and their accessories, except where noted, are Listed under UL files E63335, E103740, E103955, and Certified under CSA files LR69561 and LR88980.
Compliance with international standards
COMPACT® NS circuit breakers and their accessories comply also with the following international standards:
In that these standards are applied in most countries, COMPACT® circuit breakers and their accessories comply with European (EN 60947-1 and EN 60947-2) and the corresponding national standards:
Compliance with the specifications of marine classification organizations
COMPACT ® NS circuit breakers have been approved for marine application by the American Bureau of Shipping, Bureau Veritas, Lloyd’s Register of Shipping, Registro Italiano Navale, Germanischer Lloyd’s and Det Norske Veritas. They comply with the following standards:
Tropicalization
COMPACT ® NS circuit breakers comply with NF C 63-100 standard level 2 conditions (95% relative humidity at 45°C or 80% at 55°C, hot and humid climate conditions). They also comply with the following standards:
Pollution degree
COMPACT ® NS circuit breakers are certified for operation in pollution degree III environments as defined by IEC standard 947 (industrial environments).
Environmental protection
COMPACT ® NS circuit breakers take into account concerns for environmental protection. Most components are recyclable and parts are marked as specified in applicable standards.
Suitability for isolation (positive contact indication)
All COMPACT ® NS circuit breakers and switches are suitable for isolation as defined in the IEC 947-2 Standard:
The operating handle cannot indicate the OFF position unless the contacts are open;
Padlocks may not be installed unless the contacts are open. Installation of a rotary handle or a motor mechanism does not alter the functionality of the position indication system.
The isolation function is certified by tests guaranteeing:
Circuit breaker current limiting capacity
The exceptional limiting capacity of the COMPACT ® NS line is due to the double break technique (very rapid natural repulsion of contacts and the appearance of two arc voltages in series with a very steep wavefront). The exceptional limiting capacity of the COMPACT ® NS line greatly reduces the forces created by fault currents in devices. The result is a major increase in breaking performance. In particular, the service breaking capacity Ics is equal to 100% of Icu. The Ics value, defined by IEC 947-2, is guaranteed by tests comprising the following operations:
Longer service life of electrical installations
Current limiting circuit breakers greatly reduce the negative effects of short circuits on installations.
Thermal effects
Less temperature rise in conductors, therefore longer service life for cables.
Mechanical effects
Reduced electrodynamic forces, therefore less risk of electrical contacts or busbars being distorted or broken.
Electromagnetic effects
Less disturbance for measuring devices located near electrical circuits.
General characteristics
Compliance with standards
Compliance with North American standards
COMPACT® NS circuit breakers are built in accordance with Underwriters Laboratories Inc. UL 489 Standard and Canadian Standards Association CSA C22.2 No.5.1 Standard. Circuit breakers, switches and their accessories, except where noted, are Listed under UL files E63335, E103740, E103955, and Certified under CSA files LR69561 and LR88980.
Compliance with international standards
COMPACT® NS circuit breakers and their accessories comply also with the following international standards:
In that these standards are applied in most countries, COMPACT® circuit breakers and their accessories comply with European (EN 60947-1 and EN 60947-2) and the corresponding national standards:
Compliance with the specifications of marine classification organizations
COMPACT ® NS circuit breakers have been approved for marine application by the American Bureau of Shipping, Bureau Veritas, Lloyd’s Register of Shipping, Registro Italiano Navale, Germanischer Lloyd’s and Det Norske Veritas. They comply with the following standards:
Tropicalization
COMPACT ® NS circuit breakers comply with NF C 63-100 standard level 2 conditions (95% relative humidity at 45°C or 80% at 55°C, hot and humid climate conditions). They also comply with the following standards:
Pollution degree
COMPACT ® NS circuit breakers are certified for operation in pollution degree III environments as defined by IEC standard 947 (industrial environments).
Environmental protection
COMPACT ® NS circuit breakers take into account concerns for environmental protection. Most components are recyclable and parts are marked as specified in applicable standards.
Suitability for isolation (positive contact indication)
All COMPACT ® NS circuit breakers and switches are suitable for isolation as defined in the IEC 947-2 Standard:
The operating handle cannot indicate the OFF position unless the contacts are open;
Padlocks may not be installed unless the contacts are open. Installation of a rotary handle or a motor mechanism does not alter the functionality of the position indication system.
The isolation function is certified by tests guaranteeing:
Circuit breaker current limiting capacity
The exceptional limiting capacity of the COMPACT ® NS line is due to the double break technique (very rapid natural repulsion of contacts and the appearance of two arc voltages in series with a very steep wavefront). The exceptional limiting capacity of the COMPACT ® NS line greatly reduces the forces created by fault currents in devices. The result is a major increase in breaking performance. In particular, the service breaking capacity Ics is equal to 100% of Icu. The Ics value, defined by IEC 947-2, is guaranteed by tests comprising the following operations:
Longer service life of electrical installations
Current limiting circuit breakers greatly reduce the negative effects of short circuits on installations.
Thermal effects
Less temperature rise in conductors, therefore longer service life for cables.
Mechanical effects
Reduced electrodynamic forces, therefore less risk of electrical contacts or busbars being distorted or broken.
Electromagnetic effects
Less disturbance for measuring devices located near electrical circuits.
Standard Compliance
UL489: MP08 to MP50 circuit breakers and their accessories are Listed under UL files E63335, E103955 and E113555
UL1066/ANSI: MC08 to MC50 circuit breakers are UL Listed according to UL1066 (ANSI C37-13) under file E161835
International Standards: the MASTERPACT ® circuit breaker has been designed to meet all the major standards including:
n UL 1008: MP12, MP20 and MP30 circuit breakers are suitable for use in transfer switch equipment
High Short-time Current Rating: Up to 100 kA for 1 sec.
The exceptional short-time rating of 75,000 A in a 3000 A frame and 100,000 A in a 4000 A frame and above allows the circuit breakers to be fully selective up to their interrupting ratings.
100% Rated
The circuit breakers are designed for continuous operation at 100% of their current rating.
Other Performances
The UL 489 and UL1066 (ANSI C37-13) standard performance tests assure that the circuit breaker has sufficient characteristics to be used in normal conditions. However, the circuit breaker exceeds, without additional costs, the UL standard 1,500 operations required in endurance. The heavy-duty mechanism and the contact design provide a mechanical endurance of 10,000 operations (approx.) without maintenance (see page 64).
Tropicalization
The standard moisture and fungus protection ensure normal operation under extreme ambient conditions. MASTERPACT circuit breakers comply with T2 tropicalization (IEC Standard 68-2-30); relative humidity 95% at 113°F (45°C) and 80% at 131°F (55°C) (hot, humid climate). Salt spray resistance as per IEC 68-2-11.
Poles
The 4-pole version is an efficient solution to ground fault problems created by incorrectly grounded
standby generators and incorrect transfer switching systems. By isolating the neutral of multiple
sources coupled together, 4-pole circuit breakers prevent ground faults from returning to the source
via unintended paths. Where unintended paths exist, ground fault sensing can become inaccurate or
create nuisance tripping.
