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3 AC-3 that the transient
current peak occurring during starting does not lead tripping.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. These are not necessarily part the starter.
• Normal starting means starting tim Difficult starting means accelerating time s.)
General Remarks Applicable all Tables
• Each table defined for maximum ambient temperature °C.
Type short-circuit conditions, the contactor starter does not endanger persons installations and will able operate afterwards.
Basic Functions
Any starter designed to:
- start motors,
- ensure continuous functioning motors,
- disconnect motors from the supply line,
- guarantee protection motors against overloads.
Applicable Standards
IEC 60947-4-1 (EN 60947-4-1) precisely defines the different points considered order carry out correct coordination.
- MCCBs and MCBs: factor 0.
• the tables with MCCBs, these are fitted with the magnetic relay alone.8 applied Infor ambient temperature °C.
The starter typically made switching device (contactor) and overload protection device (thermal overload relay TOR electronic
overload relay EOR). 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. The
risk contacts light welding acceptable.
ill! I!
1SBC101001C0202
8
.
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 Complete ABB Offer
ABB has acquired years experience with respect problems coordination and able make complete offer based tests performed
in its qualified laboratories.M.S.9 applied Infor ambient temperature °C. For higher temperatures, apply derating factor according the following
rules:
- Fuses: factor 0.
- The starter derating factor depends the operating conditions thermal overload relays:
Factor 0.
• the rated prospective short-circuit current "Iq" This the maximum current that the combination can withstand, for example kA.
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. Setting always carried out 12.
Tripping classes thermal O/L relays according IEC 60947-4-1 (EN 60947-4-1): and for types and for types.
Complete coordination for combination includes the following points:
- Selectivity test between the overload relay and the short-circuit protection device SCPD.
Types Coordination
IEC 60947-4-1 (EN 60947-4-1) defines two types coordination according the expected level service continuity.8 applied Infor ambient temperature °C. Acceptable extreme dam
age for the switchgear divided into two types.
• Each table defined for motor currents: 3-phase motors, 4-pole.
A com plete data base coordination tables, according IEC 60947-4-1 (EN 60947-4-1), available the ABB Website.
- 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).
Type short-circuit conditions, the contactor starter does not endanger persons installations and will not able then operate without
being repaired having parts replaced
