KRB-5368c
-24-
4-4. OCR Cover Locking Procedure
Lock the OCR cover using a padlock with ø6 shackle as shown in Fig. 17. The OCR cover cannot be opened, which prevents OCR
settings from being changed.
Fig. 17 Padlocking the OCR cover
5. OVERCURRENT RELEASE (OCR)
Options available for the type AR ACBs include a highly reliable overcurrent release (OCR) with a built-in 16-bit microprocessor.
This OCR is supplied main circuit current signals from CT for OCR. When the OCR detects a fault, it sends a trip signal to the
magnet hold trigger (MHT) or provides a trip indication or an alarm depending on the type of the fault.
The OCR uses the root mean square sensing for the long time delay (LTD), N-phase protection (NP) and Pre-trip alarm (PTA)
functions. If a harmonic current flows through the ACB continuously, the root mean square sensing allows the ACB to operate
normally.
The OCR is available in the type that follows:
AGR-12BL
L characteristic for general feeder (for works and transformer protection)
5-1. Specifications
Specifications of the OCR are shown in Table 16.
Table 16 Specifications of type AGR-12B OCR (
: Standard,
: Optional, –: Not applicable)
Application
For general feeder
Reference
section
Characteristic
L
Type designation
AGR-12BL-AL
AGR-12BL-GL
Protective
function
Protection
characteristic
Long time delay trip (LT)
Short time delay trip (ST)
Instantaneous trip (INST)
5-2.
Ground fault trip (GF)
–
N-phase protection (NP)
Pre-trip alarm (PTA)
Trip indication
Group indication LED and
contact output
5-4.
Test function
–
–
–
Control power supply
Not required
Not required
3-3.
OCR cover
OCR cover padlock hole
Padlock
Summary of Contents for TemPower2 AR-E Series
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