The world's first EOCR with built-in ZCT
(bottom hole & terminal type)
will save space, time and wiring through unique development design during installation.
with compact size, possible to be applied to various panel size. the protection function added for high groud fault current.
most suitable for low frequency circumstance (5Hz~, Inveter use) can cover wide range current through product innovation,
so it leads to the decrease of customer's managing stocks and simplicity of replacement.
Samwha EOCR has been developing the products only related to EOCR for around 30 years, since established and now challenging the conquering of world market with the real speciality for EOCR that other companies never have.
Customer care center 1588-3473 | www.eocr.com
Applications
Building |
Industrial facilities |
Office, commercial business, residence, school, hospital |
Petrochemical, electronic, glass, steel, semiconductor, |
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chemical, medicine, cement, paint |
Control power
●24 VDC
●85~260 VAC/DC, 50/60 Hz
Composition by function
●Earth Fault
●i3BZ, iFBZ (with Modbus RS-485)
●3BZ2, FBZ2 (without Modbus RS-485)
Contact contact
●A-Type
●95-96(b), 97-98(a) : OL
●57-58(a) : GR
●C-Type
●95-96(b), 97-98(a) : OL/GR
●07-08(a) : AL/UL/TO
Public institutions
Rated current
●Over current : 0.5~80A (Definite)
●GF current : 0.03A~10A
●5~200Hz Variable frequency measurement
Motor protection
●Thermal Overload
●Over/under current
●Stall/Jam
●EF current
●Phase loss/lmbalance
Network communication
● Modbus RS-485
Gas, water supply and drainage, airport, train, port
EOCR-i3BZ/iFBZ/3BZ2/FBZ2
EOCR-i3BZ / iFBZ : Intelligent Digital Over-Current, Earth Fault Relay with built-in ZCT,
EOCR-3BZ2 / FBZ2 : Economic Digital Over-Current, Earth Fault Relay with built-in ZCT
EOCR-i3BZ / i3BZ2 Bottom hole type |
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EOCR-iFBZ / iFBZ2 Bottom hole type |
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EOCR-i3BZi / 3BZ2 Terminal type |
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EOCR-iFBZ / iFBZ2 Terminal type |
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General Features
Earth fault detection by built-in ZCT
Multifunctional motor protection for rated motor currents up to 80A (Definite Overcurrent protection) : Over Current, Under Current, Phase Loss, Phase Reversal, Stall, Jam, Current Imbalance, Earth Fault
Thermal Inverse / Inverse overload protection up to 32Amps by integrated CTs.
Real Time Processing / High Precision
Ancillary Functions : Fail Safe, Alert(“C” Type Only), Accumulated Running Hour, 3 Fault records & limitation of auto-reset attempt.
Communication : Modbus-RTU/RS-485(i3BZ/iFBZ only)
Reinforced Monitoring Function : Real Time Monitoring up to 400M, 3 Phase Current Display, Pre-alarm & Cause of Trip indication.
Load ratio indication of Load Current to over-current threshold.
Support Single-phase and 3 Phase Motor
For iFBZ / FBZ2, normal operation except display is guaranteed when PDM is disconnected
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EOCR-i3BZ/iFBZ/3BZ2/FBZ2
EOCR-i3BZ / iFBZ : Intelligent Digital Over-Current, Earth Fault Relay with built-in ZCT,
EOCR-3BZ2 / FBZ2 : Economic Digital Over-Current, Earth Fault Relay with built-in ZCT
Protection functions
Item |
Operating Condition & Setting Range |
Operation Time |
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Over Current (oc) |
Load current(In) exceeds threshold(Is) |
Definite(Def) : 0.2~30s Adjustable |
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Setting Range : 0.5~80A(Def), 0.5~32A(Inv & th) |
Inverse(Inv) & Thermal(th) : 1~30 Class |
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Under Current (uc) |
Load current(In) less than threshold(uc) In <= uc |
oFF, 1~30s Adjustable |
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uc should be less than oc Setting |
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Phase Loss (PL) |
max imbalance is more than 85% among 3 phase current, |
oFF, 0.5~5s Adjustable |
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Enable or disable : Selectable |
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Reverse Phase(rP) |
Reversed phase sequence input on EOCR. |
Within 0.15s |
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Enable or disable : Selectable |
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Active only in motor starting, In ≥Stall threshold (Sc×OC). |
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Stall (Sc) |
Setting Range : Adjustable |
Immediately after D-Time elapsed |
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2~8 times of oc setting if Sc×OC doesn’t exceed 250A |
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Active only in motor running, In ≥Jam threshold (JA×OC). |
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Jam (JA) |
Setting Range : |
0.2~10s Adjustable |
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1.5~8 times of oc setting if JA×OC doesn’t exceed 250A |
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Current unbalance ≥threshold1~10s Adjustable. |
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Unbalance (ub) |
Setting Range : 10~50% |
1~10s Adjustable |
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Unbalance[%] = 100 ×(Max phase current - Min phase current)/ |
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Max phase current |
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Earth Fault (EF) |
EF current(Ie) exceeds threshold(Ies) |
0.1~10s Adjustable |
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Setting Range : oFF, 0.03~10A |
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Auxillary functions
Password |
Secure configuration, available only with i3BZ/iFBZ |
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Communication |
Serial network communication for monitoring of metering, status, and fault history |
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Fail Safe |
Enable/Disable fail-safe operation of OL trip output |
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Phase selection |
Select a Single-phase motor or 3-Phase motor |
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Total Running-Hour |
Record of total running from installation which cannot be modified or cleared |
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Running-Hour |
Accumulated running hour from preset point which can be cleared to zero, when motor stops |
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Fault History |
Records for recent 3 faults each phase current which stored in a non-volatile memory |
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Limitation of autoreset attempt |
Block auto-reset if the reset count exceeds the pre-set count within 30 minutes |
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Communication function (Applicable to i3BZ/iFBZ)
Item |
Setting |
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Remark |
Protocol type |
Modbus RTU |
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Communication type |
RS-485 |
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Baud rate |
1.2, 2.4, 4.8, 9.6, 19.2, 38.4 kbps |
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Maximum length of the bus |
Maximum 1.2kM |
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Depend on the environment |
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Type of trunk cable |
RS-485 Shielded Twist 2-Pair Cable |
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