Page 515 - Motor protection and control Manual motor starters, contactors and overload relays

ABB MOTOR PROTECTION AND CONTROL 3/441

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Questionnaire for product specifications:

Block contactors

Other comments: 03
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User Guide for the questionnaire
This document is used to define the contactor specifications according to the complete information on the application.
Do not hesitate to join some complementary documents if necessary (schemes, tables, customer specification…).
Please see below some definitions to help you :

Operating cycle
Includes one making operation and one breaking operation.

Electrical Durability
Number of on-load operating cycles that the contactor is able to carry out. It depends on the utilization category.
Mechanical Durability
Number of no-current operating cycles that the contactor is able to carry out
Load Factor
Ratio of the on-load operating time to the total cycle time x 100 (%).
Intermittent Duty
Duty during which the contactor is successively closed or open for periods which are too short to enable the contactor to achieve
thermal balance.
Temporary Duty
Duty in which the main contacts of the contactor remain closed for periods insufficient to allow the equipment to reach stabilized
temperature, the unload periods being separated by off-load periods of sufficient duration to restore the ambient temperature
Continuous Duty
Duty in which the main contacts of the contactor remain closed, with a continuous current during enough time to reach thermal sta-
bilization, but no more than eight hours without interruption.
Ambient Temperature
Air temperature close to the contactor.
Mounting Position
Comply with the manufacturer's instructions. Restrictions could be taken into account for certain mounting positions.
A contactor's duty is characterized by the utilization category together with the rated operational voltage and current indicated:
Utilization categories for contactors according to IEC 60947-4-1
Utilization categories for contactor relays according to IEC 60947-5-1
See our catalog p7/8
Making and breaking current
Current at contactor closing or at contactor opening
Time constant L/R (for DC circuit)
Ratio of the inductance to the resistance (L/R = mH/Ω = ms)

1SBC101701S0201