All electrical circuits need protection so an overload condition can be detected and the circuit opened until the 
overload can be corrected. The inexpensive protection of a circuit breaker can save the failure of an expensive 
piece of equipment or an even greater loss due to an electrical fire.
The result of an electrical overload is the generation of heat. A fuse has a metal element which is designed to 
melt and open the circuit at a relatively low heat. A circuit breaker uses an element of two different metals. 
Heat causes the elements to bend and separate, thus opening the circuit. A melted fuse must be replaced, but a 
circuit breaker can continue to function after the cause of the overload is corrected.
Most electrical systems have a number of circuits, and since each circuit can operate independently, each needs 
protection. With direct current circuits in a battery powered vehicle, the need for circuit protection is 
important. When comparing the cost of an engine starter or other equipment in a car or truck to the cost 
of a circuit breaker, it is obvious circuit protection is not a choice but a necessity.
Circuit breakers are the choice for protection in most heavy duty vehicles and equipment. GLORYTECH offers more 
than 15 types of breakers to suit the requirements of both equipment design engineers and aftermarket replacement,
for vehicles on and off the road and equipment in the field or on the construction site.
GLORYTECH circuit breakers are manufactured and tested in accordance with SAE recommended practice J553C.
Standard J553 defines testing and performance requirements for circuit breakers up to 50A. For 6V, 12V, and 24V 
It defines the three types of reset: Type I, Type II and Type III.

Type I - Automatic Reset
Circuit breaker automatically resets after opening. If the fault still exists, the breaker will continue to cycle 
between ON and OFF positions until the overload is corrected.These devices are sometimes called "cycling breakers".

Type II - Modified Reset
The circuit breaker will remain tripped (in the OFF position) as long as there power to the circuit, due to an 
internal resistor. Type II breakers can be reset by turning off the circuit, or by turning off the ignition switch
These devices are sometimes called "non-cycling breakers".

Type III - Manual Reset
The circuit breaker will remain tripped (in the OFF position) until an indicator button or lever is manually reset
Type III breakers are also available with a switchable feature, which allows you to use an external button to disable
the circuit.


Conforming Circuit Breakers:
Must carry 100% of rated current continuously for a minimum of 1 hour.
Must open at 135% of rated current within 1 hour.
Must open at 200% of rated current within 1 minute.

The specific current capacity of the circuit breaker is a function of the particular electrical system being utilized.
It is recommended that the actual performance be verified through testing experimentally in the proposed application.
Several factors should be considered:

Ambient Temperature
Circuit breakers are thermal devices. Changes in the ambient temperature will have an effect on the current carrying 
capacity and on the effective limitation of current during overload cycling.

Voltage Rating
The rating marked on breakers is the maximum value recommended. Use at higher voltages may significantly shorten the 
ultimate life under overload conditions, and possibly cause damage to your equipment.
Circuit protection components are thermal devices that create an open circuit under overcurrent conditions.
They are deliberately designed as the sacrificial weakest link in a system, protecting components from costly damage.
It is important to select a fuse or circuit breaker with a current rating equal to or lower than the lowest current 
rating of any part of the circuit.
We offers the industry largest selection of automotive circuit breakers including both OEM-style and fuse-replacement devices.
(Note: Always follow the OEM recommendations when replacing circuit breakers.
Replace only with the same type breaker in aftermarket applications.)


Introduction Of Circuit Breaker



High Power Manual Reset Circuit Breaker 

Mounting Rail