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Complete Circuit Breakers Catalog - 16475 Circuit Breakers

Instructions

Instructions: All Series

Switches & Pilot LightsDisplay LightsRelays & SocketsTimersTerminal BlocksCircuit Breakers

General Applications

IDEC’s circuit breakers have been developed for the protection of electrical circuits and small-sized electrical equipment and provide excellent protection against overloads and short-circuits.Additionally, IDEC’s circuit breakers are designed to suit specifi c needs. Each series offers unique circuit protection characteristics and a choice of actuator styles. The IDEC NRA circuit breaker series features superior overload and short-circuit protection. Many combinations of protection mechanisms and internal circuit connections enable wide applications. Precision measuring instruments: electronic counters, projection instruments, oscilloscopes, industrial instrumentation, and analytic devices Industrial machinery: printers, elevators, cranes Chemical and food industry machines: vacuum devices, wrappers, centrifuges, agitators ••• • • • • • Machine tools: mill grinders, drills, presses

IDEC’s Circuit Breaker Features

Business machines: vending machines, beauty salon equipment, enter-tainment games Various models are available with different tripping characteristics and rated currents1- to 3- multi-pole Inertia delay Auxiliary contacts and alarm contacts The electromagnetic tripping system is not affected by ambient temperature Safe trip-free mechanism Vibration- and impact-resistant design When using accessories such as plug-in bases, fl ush plates, and colored caps, a variety of mounting styles is possible — such as DIN rail mounting, snap mounting into panel cut-outs, and color-coded arrangement on the panel Other: offi ce equipment, air-conditioners, conveyor belts, and many more

How the Breaker Operates

IDEC’s hydraulic magnetic circuit breakers operate like a solenoid coil. The coil unit consists of an oil-fi lled tube with a metal core at one end and a pole piece and armature at the opposite end with a spring in between.When a current load passes through the coil winding, it creates a magnetic fi eld. As long as the current load is either at or below the nominal rating of the breaker, the metal core will remain stationary.If the current load increases beyond the nominal rating, the strength of the magnetic fi eld causes the core to move toward the pole-end of the tube. The oil viscosity regulates the core’s movement through the tube, thereby regulating the time delay. As the percentage of current load increases, the required trip time of the breaker decreases and vice versa.When the current reaches the overload rating, the metal core will meet the pole piece at the opposite end of the tube. At this point, the armature is attracted to the same pole piece, tripping the breaker.In case of sudden short circuit, the magnetic fi eld created will instantly trip the breaker.

Mounting Instructions: Installation Angle

Designed to be mounted on a vertical surface, the circuit breakers should be mounted on a surface within 10° of the vertical plane. If the circuit breaker is mounted on a horizontal surface or at any angle other than the specifi ed angle, its characteristics will be changed.

Multi-Pole Assemble

Multi-pole types such as 2- or 3-pole should be assembled by IDEC. Because of their characteristics, 1-pole breakers cannot be combined to produce multi-pole units.

Internal Circuits Overview

DescriptionCircuit Example Series Trip This is the most common circuit breaker, providing overload and short circuit protection. It can also be used as an ON/OFF switch. Load Series Trip with Auxiliary Contact Since the auxiliary contact operation is interlocked with the ON/OFF of the main contactor, circuit breaker operation can be monitored by a lamp or buzzer. This circuit breaker can also be used to control auxiliary circuits up to 250V AC/5A (resistive load). Load A Load B Series Trip with Alarm Contact Since the alarm contact is electrically independent of the main contactor, but actuates when the protective element operates. The alarm can be used with a lamp or buzzer to monitor trip operations, and can also be used for controlling alarm circuits. The contact rating is 250V AC/5A (resistive load). Load A Load B

USA: 800-262-IDEC Canada: 888-317-IDEC

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