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• the rated prospective short-circuit current "Iq" This the maximum current that the combination can withstand, for example kA.
Tripping classes thermal O/L relays according IEC 60947-4-1 (EN 60947-4-1): and for types and for types.8 applied Infor ambient temperature °C.
- 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).
• the tables with MCCBs, these are fitted with the magnetic relay alone. This offer includes 400 500 690 networks.
Type short-circuit conditions, the contactor starter does not endanger persons installations and will able operate afterwards. These are not necessarily part the starter.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.
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.
Applicable Standards
IEC 60947-4-1 (EN 60947-4-1) precisely defines the different points considered order carry out correct coordination.
- The starter derating factor depends the operating conditions thermal overload relays:
Factor 0.
• Each table defined for motor currents: 3-phase motors, 4-pole.
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. For example:
r 1kA for AC-3 A
r for IeAC-3 A
r for IeAC-3 125 etc.
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.
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.8 applied Infor ambient temperature °C.9 applied Infor ambient temperature °C.
• Normal starting means starting tim Difficult starting means accelerating time s.
Type short-circuit conditions, the contactor starter does not endanger persons installations and will not able then operate without
being repaired having parts replaced.
- MCCBs and MCBs: factor 0. The
risk contacts light welding acceptable.
A com plete data base coordination tables, according IEC 60947-4-1 (EN 60947-4-1), available the ABB Website. Acceptable extreme dam
age for the switchgear divided into two types.
Complete coordination for combination includes the following points:
- Selectivity test between the overload relay and the short-circuit protection device SCPD.
The starter typically made switching device (contactor) and overload protection device (thermal overload relay TOR electronic
overload relay EOR). For higher temperatures, apply derating factor according the following
rules:
- Fuses: factor 0. Setting always carried out 12.M.
ill! I!
1SBC101001C0202
8
.S.3 AC-3 that the transient
current peak occurring during starting does not lead tripping.)
General Remarks Applicable all Tables
• Each table defined for maximum ambient temperature °C
