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11. Protection releases - General notes
The ABB SACE Emax series of air circuit-breakers can be equipped with electronic relay PR121/P.
The available accessories and functions are listed in the table below.
Function/Unit
Current protections (L, S, I, G)
Thermal memory
Local bus for external accessory units
Front connector for test unit and temporary power supply
Compatibility with Ekip Connect
HMI030 (Display via switchgear for ABB SACE relay)
Flex Interface (External signalling unit)
PR030/B (External power supply unit)
BT030-USB (External Bluetooth and USB powering and communication unit)
Ekip T&P (External unit for power supply, communication and testing via USB)
PR010/T (External unit for tests)
Key:
S
: standard function/unit
O : optional fi xed unit
T : optional unit for temporary connection.
The main characteristics of relay PR121 are:
1. Highly accurate current reading (up to 1.5%).
2. Continuous control of the connection of the current sensors and trip coil.
3. Recording of the cause for tripping, also in the self-supply condition.
4. Extended neutral selection.
5. Connection to a PC via wireless Bluetooth (with BT030-USB) or USB (with BT030-USB or Ekip T&P).
6. Serial connection for external modules HMI030 and Flex Interface.
7. "Real time" date and time (adjustable with BT030-USB or Ekip T&P).
8. Software applications available for relay maintenance and tests.
11.1. Safety notes
WARNING: this symbol gives information about operations, actions or circumstances that can cause injuries to
the personnel, damage to the unit or economic losses.
Read this manual carefully and completely.
The use of this device should be reserved for qualifi ed and expert personnel only.
If in doubt, about its safe usage, the unit must be put out of service to prevent any accidental use.
You must assume that safe usage is impossible if:
1. the unit shows visible signs of damage.
2. the unit does not function (for example with autotest or with the trip test unit).
3. the unit has been damaged in transit.
WARNING: Prior to servicing and/or replacing, the circuit-breaker must be open.
Also remember to disconnect all power supplies connected.
11.1.1. Notes for dielectric stiffness tests
WARNING: Dielectric stiffness tests on the releases, inputs and outputs, are not permitted.
Model
L6555
Apparatus
Doc. no.
1SDH000460R0002
PR121
S
S
S
S
S
O
O
T
T
T
T
Scale
Emax
Page No
34/74
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