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• the rated prospective short-circuit current "Iq" This the maximum current that the combination can withstand, for example kA. For higher temperatures, apply derating factor according the following
rules:
- Fuses: factor 0.
Type short-circuit conditions, the contactor starter does not endanger persons installations and will not able then operate without
being repaired having parts replaced.
- 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).
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.
The starter typically made switching device (contactor) and overload protection device (thermal overload relay TOR electronic
overload relay EOR).
- MCCBs and MCBs: factor 0.8 applied Infor ambient temperature °C. These are not necessarily part the starter. Acceptable extreme dam
age for the switchgear divided into two types.
• Each table defined for motor currents: 3-phase motors, 4-pole.
• the tables with MCCBs, these are fitted with the magnetic relay alone.M.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.)
General Remarks Applicable all Tables
• Each table defined for maximum ambient temperature °C. For example:
r 1kA for AC-3 A
r for IeAC-3 A
r for IeAC-3 125 etc.
Basic Functions
Any starter designed to:
- start motors,
- ensure continuous functioning motors,
- disconnect motors from the supply line,
- guarantee protection motors against overloads.
Types Coordination
IEC 60947-4-1 (EN 60947-4-1) defines two types coordination according the expected level service continuity.3 AC-3 that the transient
current peak occurring during starting does not lead tripping.
A com plete data base coordination tables, according IEC 60947-4-1 (EN 60947-4-1), available the ABB Website.
Applicable Standards
IEC 60947-4-1 (EN 60947-4-1) precisely defines the different points considered order carry out correct coordination. Setting always carried out 12.8 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.
- The starter derating factor depends the operating conditions thermal overload relays:
Factor 0.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.
ill! I!
1SBC101001C0202
8
.
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.
Complete coordination for combination includes the following points:
- Selectivity test between the overload relay and the short-circuit protection device SCPD.
• Normal starting means starting tim Difficult starting means accelerating time s.9 applied Infor ambient temperature °C. The
risk contacts light welding acceptable.
Type short-circuit conditions, the contactor starter does not endanger persons installations and will able operate afterwards. This offer includes 400 500 690 networks
