What is an auxiliary contact?
Auxiliary contact is the contact in the auxiliary circuit that is operated mechanically. Auxiliary contact is also referred to as supplementary contact or control contact. It is used for auxiliary functions on a contactor, relay, or circuit-breaker.
What is an auxiliary contact block?
The auxiliary contact blocks are used for the operation of auxiliary circuits and control circuits for standard industrial environments. Types of auxiliary contact blocks for side mounting: – CAL 2-pole block, with instantaneous N.O. + N.C. contacts. For clipping onto the right- and/or left-hand side of the contactors.
What are the ratings of auxiliary contacts?
Auxiliary contacts are rated A600 for AC voltages and P600 for DC voltages as shown below: A600 is rated 10 amp maximum continuous carrying current with maximum make volt-amp rating of 7200 VA and maximum break volt-amp rating of 720 VA.
How many contacts are in a circuit breaker?
There are three types of circuit breaker contacts: Arcing, which transfers the arc, or the heated, glowing electrical current, to the arc runners (contacts) in the arc chute (contact connectors). Main, which carries the main load current. Auxiliary, which makes and breaks the control circuits.
What is the difference between auxiliary contacts and load contacts?
Auxiliary contacts are small and are intended to be used as part of the control circuit. Load contacts are large and designed to control a large amount of current. This prevents electrical noise from being transmitted to the control side of the circuit.
What is the purpose of auxiliary contactor?
Basically, an auxiliary contactor is a regular (low-power) relay – but built like a “regular” contactor and when used together with another contactor it is called auxiliary contactor to clarify that it is not used for switching loads but has an activation/deactivation or control function instead – used to connect/ …
How does auxiliary contact block work?
How do auxiliary contacts work? Auxiliary contacts are affixed to the main contacts and change state when the main contacts do. They pass the data from the circuit to a logic controller, which in turn gives instructions to the linked devices about whether to turn on or off.
What is relay contact rating?
Contact ratings are the standard values for guaranteed relay performance and generally indicates the current rating of the relay contacts. In other words, the rating includes the specification of the maximum voltage applied to the relay contacts and the maximum current that can be passed to control the electrical load.
What is pilot duty rating?
A “Pilot Duty” rating means that this relay is made for a specific highly inductive load, such as controlling the coil of another relay or contactor. Contacts with a “Pilot Duty” rating have passed standardized testing to prove they can reliably control a “Pilot Duty” load.
What causes the 52 auxiliary contacts to open or close?
A form ‘a’ contact represents a Normally Open (N.O.) contact. Thus when the breaker is open, its 52a contacts are open. When the breaker is closed, the 52a contacts are closed.
Why contact wipe is necessary for a circuit breaker?
Wipe has three main purposes: to provide a means to compensate for contact erosion over time. to provide a force which forms the contacts to one another to maintain a low contact resistance. to counteract the “popping”, or “blow-off” force caused when a large amount of current travels through the.
What is the primary purpose of auxiliary relays?
Auxiliary relays are used in protection system to provide isolation of primary and back-up relaying. This is to isolate them from unnecessary signals in the form of current especially during tripping.