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The
risk contacts light welding acceptable.General Information
Coordination with Short-circuit Protection Devices
In compliance with standards IEC 60947-4-1 and 60947-4-1, define for the contactors and starters the type, rating and characteristics of
the short-circuit protection devices SCPD which allow selective protection against overloads and ensure protection against short circuits.
• Normal starting means starting tim Difficult starting means accelerating time s.
In the coordination tables, the following short-circuit protection devices are recommended:
• Moulded case circuit-breakers (MCCBs)
• Miniature circuit-breakers (MCBs)
• Switch-disconnector-fuses (aM, and BS)
• Manual Motor Starters (M.
• the rated prospective short-circuit current "Iq" This the maximum current that the combination can withstand, for example kA.
- The starter derating factor depends the operating conditions thermal overload relays:
Factor 0.
Complete coordination for combination includes the following points:
- Selectivity test between the overload relay and the short-circuit protection device SCPD.
Applicable Standards
IEC 60947-4-1 (EN 60947-4-1) precisely defines the different points considered order carry out correct coordination.
Type short-circuit conditions, the contactor starter does not endanger persons installations and will able operate afterwards.
• the tables with MCCBs, these are fitted with the magnetic relay alone. For example:
r 1kA for AC-3 A
r for IeAC-3 A
r for IeAC-3 125 etc. This offer includes 400 500 690 networks.
These two devices MUST coordinated with equipment capable providing protection against short circuit (SCPD: short-circuit protective
device): typically circuit breaker with magnetic release only switch fuse.
Types Coordination
IEC 60947-4-1 (EN 60947-4-1) defines two types coordination according the expected level service continuity. Acceptable extreme dam
age for the switchgear divided into two types.M.
Basic Functions
Any starter designed to:
- start motors,
- ensure continuous functioning motors,
- disconnect motors from the supply line,
- guarantee protection motors against overloads.
- MCCBs and MCBs: factor 0.
The Complete ABB Offer
ABB has acquired years experience with respect problems coordination and able make complete offer based tests performed
in its qualified laboratories.
Type short-circuit conditions, the contactor starter does not endanger persons installations and will not able then operate without
being repaired having parts replaced.
ill! I!
1SBC101001C0202
8
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A com plete data base coordination tables, according IEC 60947-4-1 (EN 60947-4-1), available the ABB Website.8 applied Infor ambient temperature °C.
Tripping classes thermal O/L relays according IEC 60947-4-1 (EN 60947-4-1): and for types and for types. For higher temperatures, apply derating factor according the following
rules:
- Fuses: factor 0.3 AC-3 that the transient
current peak occurring during starting does not lead tripping.9 applied Infor ambient temperature °C.
• Each table defined for motor currents: 3-phase motors, 4-pole.
The starter typically made switching device (contactor) and overload protection device (thermal overload relay TOR electronic
overload relay EOR).S.
- Short-circuit condition tests:
• prospective "r" currents These currents depend the rated operational current the starter (IeAC-3) and are given the standard
(Table 11).)
General Remarks Applicable all Tables
• Each table defined for maximum ambient temperature °C. Setting always carried out 12. These are not necessarily part the starter.8 applied Infor ambient temperature °C
