ABB Automatic Transfer Switch OTM_C_21D

Operating angle: 

90° (O - I, I - O, O - II, II - O) and 180° (I - O - II, II - O - I), which specifies the angle range of the switch when switching, 

and influences the design of its mechanical structure and the way of operation.

OFF time and total switching time: OFF time 0.6 - 0.7 s, total switching time 2.5 s. 

These time parameters are essential to guarantee the continuity and stability of the power supply, and a shorter switching time reduces the impact of power failures on the equipment.

Output relay utilisation category: 

3A, AC1, 250V, specifies the load capacity and applicable circuit type of the output relay, guides the user to select and use the relay correctly,

 and ensures its stable operation in the corresponding electrical environment.

Electromagnetic compatibility: 

Class B, indicating the anti-interference ability of the switch in the electromagnetic environment and its own level of electromagnetic interference to the outside world, 

in line with the relevant standards, and can operate normally in an environment where a variety of electrical equipment coexists.

Protection level: 

IP20 (front panel only), indicating that the front panel can protect the entry of objects with a diameter greater than 12.5mm, 

and play a certain role in protecting the internal circuits.

Operating, transport and storage temperatures and altitude: 

operating temperature - 25 to 55°C, transport and storage temperature - 40 to 70°C, altitude up to 2000 m. 

These data limit the environmental conditions in which the switches can be used, 

and the user needs to choose the appropriate installation location according to the actual scenario to ensure the performance and life of the switches.