Functions and Application Scenarios:
The 24-volt numerical control contactor is mainly used in air compressors for:
Controlling the start and stop of the main motor, by connecting or disconnecting the main power circuit through the contactor contacts;
Controlling the operation of auxiliary equipment (such as oil heaters, fan motors), ensuring that the equipment starts under suitable conditions (such as preheating the oil at low temperatures);
Cooperating with the controller (such as the Elektronikon system) to achieve automatic start-stop, overload protection and other functions. When the system detects an abnormality, the contactor quickly disconnects to cut off the power supply.
Core Features of Original Assembly Parts:
The original 24-volt numerical control contactor has the following advantages:
Safe and reliable: The coil has a rated voltage of 24V DC/AC (specifically depending on the model), which belongs to a safe extremely low voltage, reducing the risk of electrical operation;
High durability: The contacts are made of silver alloy, resistant to arc oxidation, with a rated current matching the power of the air compressor motor (usually 10-100A), and the service life can reach over a million times;
Precise compatibility: The installation dimensions, terminal blocks, and the electrical cabinet of the air compressor are fully matched, and the coil parameters are compatible with the controller's output signal, avoiding incorrect actions;
Protection functions: Some models have built-in overload protection or surge suppression devices to prevent voltage fluctuations from damaging the contactor or the motor.
Key Points for Model Matching:
When selecting, pay special attention to the following parameters:
Air compressor model (such as GA7.5, GA45VSD) and the power of the main motor (determining the rated current of the contactor);
The purpose of the contactor (main motor control, auxiliary equipment control, etc.);
The type of coil voltage (24V DC or 24V AC, which must be consistent with the controller's output);
The part number of the old contactor (usually marked on the casing, such as 1094888500, etc.).
For example, the main contactors for small power models (such as GA5-15) and large power models (such as GA75-160) have significant differences in rated current and installation dimensions, and need to be precisely matched.
