The difference between contacts and relays

The difference between contacts and relays

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Contactors, mainly used for the primary circuit, a large current can be (up to a few hundred to more than a thousand A); and relay the secondary circuit is used only by a small current (a few dozen to A A), to achieve a variety of control functions. For the distinction between the two, the following small series will introduce in detail:

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1, the role is not the same: the primary role is to relay the signal detection, transfer, use or disposal of the conversion, it’s off the circuit current is generally small, usually used in the control circuit, a control signal is weak.

The primary role of contacts is used to connect or disconnect the main circuit. The main circuit refers to a circuit or not is not switched on by this circuit is marked. The main circuit and control circuit corresponds to the concept. Through the main circuit current is generally larger than the control circuit.

Large capacity contactors are generally with the interrupter cover. Relay contact capacity is generally not exceed 5A, a small relay contact capacity is generally only 1A or 2A, the contacts and the contact also has the smallest capacity 9A; contactor contacts generally have three pairs of main contact (primary contact head are normally open contact) in addition to several of his assistant contacts.

The relay contacts in general, regardless of primary and secondary; relay contacts are sometimes arranged in pairs, normally open contacts and normally closed contacts together, and not to set up contacts; relay on specific needs, will in combination with other devices into the planning time relays, counters, pressure switch, etc., have additional functions, and generally do not have contact.

2. The contact opening and closing: Further contacts used to connect or disconnect power a large load, with the (power) of the main circuit, the main contact with the chain can open and close contacts to indicate when the main contacts.

The relays are typically used in electrical control circuit used to expand micro or small relay contact capacity to drive large load. As can be relay contacts to connect or disconnect the contactor coil. Usually there are more opening and closing relay contacts, of course, through the appropriate connection relay can also end some extra functions, such as logical operations and so on.

3. Both of the above in common: both are controlled by an electric coil or no electricity to drive the opening and closing of the contacts to open or close the circuit. Attribution electrical contacts. Coil control circuit and the contact address of the electrical circuit is electrically isolated.

Generally refers to a digital trigger logic devices (e.g., integrated chip), by the end of the external triggers certain logic functions. Triggers such as d, t trigger, j-k flip-flops, r-s triggers. Triggers can also be simple to use electronic devices to each end. Trigger There are many ways, such as: rising, falling, high, low.

-> Contactors, mainly used for the primary circuit, a large current can be (up to a few hundred to more than a thousand A); and relay the secondary circuit is used only by a small current (a few A to more than A), to achieve a variety of control functions. For the distinction between the two, the following small series will introduce in detail:

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1, the role is not the same: the primary role is to relay the signal detection, transfer, use or disposal of the conversion, it’s off the circuit current is generally small, usually used in the control circuit, a control signal is weak.

The primary role of contacts is used to connect or disconnect the main circuit. The main circuit refers to a circuit or not is not switched on by this circuit is marked. The main circuit and control circuit corresponds to the concept. Through the main circuit current is generally larger than the control circuit.

Large capacity contactors are generally with the interrupter cover. Relay contact capacity is generally not exceed 5A, a small relay contact capacity is generally only 1A or 2A, the contacts and the contact also has the smallest capacity 9A; contactor contacts generally have three pairs of main contact (primary contact head are normally open contact) in addition to several of his assistant contacts.

The relay contacts in general, regardless of primary and secondary; relay contacts are sometimes arranged in pairs, normally open contacts and normally closed contacts together, and not to set up contacts; relay on specific needs, will in combination with other devices into the planning time relays, counters, pressure switch, etc., have additional functions, and generally do not have contact.

2. The contact opening and closing: Further contacts used to connect or disconnect power a large load, with the (power) of the main circuit, the main contact with the chain can open and close contacts to indicate when the main contacts.

The relays are typically used in electrical control circuit used to expand micro or small relay contact capacity to drive large load. As can be relay contacts to connect or disconnect the contactor coil. Usually there are more opening and closing relay contacts, of course, through the appropriate connection relay can also end some extra functions, such as logical operations and so on.

3. Both of the above in common: both are controlled by an electric coil or no electricity to drive the opening and closing of the contacts to open or close the circuit. Attribution electrical contacts. Coil control circuit and the contact address of the electrical circuit is electrically isolated.

Generally refers to a digital trigger logic devices (e.g., integrated chip), by the end of the external triggers certain logic functions. Triggers such as d, t trigger, j-k flip-flops, r-s triggers. Triggers can also be simple to use electronic devices to each end. Trigger There are many ways, such as: rising, falling, high, low.

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