In the vast field of industry that requires advanced automation and electrical control, the 21A current level marks a widely used intersection point - it is powerful enough to drive mainstream small and medium-sized production equipment; It is standardized enough to become one of the most commonly used components in electrical design. As a professional AC contactor manufacturer in China, our durable 21A AC Electrical Contactor of SPX is the "universal cornerstone" of this range. It does not pursue extreme performance parameters, but provides engineers and system integrators with a "no mistake" standard selection based on classic design, reliable performance, wide availability, and excellent cost-effectiveness. Whether it is for standardized design in new projects or as a replacement for spare parts in maintenance, it can seamlessly integrate and play the role of a strong executor in the control loop.
With a rated current of 21A, it accurately corresponds to a three-phase asynchronous motor of about 11kW at 380V voltage, or a load of about 4.6kW at single-phase 220V, perfectly covering the current requirements of the vast majority of small and medium-sized fans, water pumps, compressors, conveyors, and heating circuits.
Reliable electrical lifespan: The main contact is made of silver based alloy material and has been optimized for arc extinguishing design. Under the standard AC-3 usage category (motor start stop), it can ensure reliable electrical operations for tens of thousands or even over 100000 times, meeting the frequent start stop requirements in industrial environments.
The coil design has good resistance to voltage fluctuations, and the overall structure is insensitive to dust, moisture, and certain temperature changes. It can work stably in general industrial environments with low maintenance requirements.
The high quality 21A AC Electrical Contactor is typically installed on a standard 35mm DIN rail and can be neatly arranged with other circuit breakers, relays, and other components. Provide screw crimping terminals for stable and reliable connection.
Most models support the convenient installation of auxiliary contact modules on the top or side to expand control signals (such as self-locking, interlocking, and status feedback), meeting complex logic control requirements without the need to replace the main contactor.
Main power on/off control for 7.5kW-11kW three-phase fans, water pumps, air compressors, and small machine tools.
Start stop execution unit for medium-sized fan coil units, fresh air units, and circulating water pumps.
The customized 21A AC Electrical Contactor is used for motor control to drive light to medium conveyor belts and elevators.
As a remote control switch for lighting group control and electric heating equipment (such as small boilers).
The 21A AC Electrical Contactor serves as a standard actuator for PLC or relay output terminals, controlling the power of a single workstation.
| Frame(A) | SS-T21 | ||||||||
| KW/HP(AC-3) Reted power(AC-3) IEC60947-4 | 220V | 4 | |||||||
| 380V | 7.5 | ||||||||
| Reted current(AC-3) GB14048.4 | 220V | 20 | |||||||
| 380V | 20 | ||||||||
| Reted heating current(A) | 32 | ||||||||
| Reted insutaled voltage(V) | 660 | ||||||||
| Auxicary contact AC-15 | Contact | Standard | 2NO+2NC | ||||||
| Reted current (A) | 220V | 1.6 | |||||||
| 380V | 0.95 | ||||||||
| Electric life | 100 | ||||||||
| Machanical life | 500 | ||||||||
| Outline and installation dimension |
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| Type | L | W | H | C1 | C2 | ΦD | |||
| SS-T21 | 63 | 81 | 81 | 58 | 54 | 4.5 | |||
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