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Bender GmbH & Co. KG
PO Box 1161 • 35301 Grünberg • Germany
Londorfer Str. 65 • 35305 Grünberg • Germany
Tel.: +49 6401 807-0 • Fax: +49 6401 807-259
MRCDB300-series_D00343_05_Q_XXEN/01.2022/ pdf / © Bender GmbH & Co. KG, Germany – Subject to change! The specied standards take into account the edition valid until 02/2022 unless otherwise indicated.
Technical data
Rated voltage .................................................................... 800 V
Overvoltage category............................................................... III
Nominal supply voltage Us...............................................DC 24 V
Operating range Us............................................................±20 %
Power consumption........................................................≤ 2.5 W
Measuring circuit
Characteristics acc. to IEC/TR 60755 ....... AC/DC sensitive, type B
Response values IΔn .............refer to intended purpose on page 2
Prewarning.......................................................50 %…100 % IΔn
Rated current In
CTBC20 when IΔn ≥ 30 mA ....................................................40 A
CTBC20 when IΔn ≥ 300 mA ..................................................63 A
CTBC20P................................................................................80 A
CTBC35 when IΔn ≥ 30 mA ....................................................80 A
CTBC35 when IΔn ≥ 300 mA ................................................125 A
CTBC35P..............................................................................160 A
CTBC60 when IΔn ≥ 30 mA ..................................................160 A
CTBC60 when IΔn ≥ 300 mA ................................................250 A
CTBC60P..............................................................................320 A
CTBC120 when IΔn ≥ 100 mA ..............................................330 A
CTBC120P when IΔn ≥ 100 mA ............................................630 A
CTBC210 when IΔn ≥ 300 mA ..............................................630 A
CTBC210P when IΔn ≥ 100 mA ............................................630 A
CTBC210P when IΔn ≥ 300 mA ..........................................1000 A
Measurement accuracy.......................... ±1 % of full scale value
Test winding.......................................................................... yes
Rated continuous thermal current Icth ...................................30 A
Rated short-time thermal current 1) Ith ......................... 2.4 kA/1 s
Rated dynamic current 1) Idyn ......................................6 kA/40 ms
1) refers to the residual current
Operating uncertainty ...................................................±17.5 %
Relative uncertainty ................................................... 0…-35 %
Outputs
Outputs.....................................................2 changeover contacts
Operating principle..............................configurable, see manual
Switching outputs (K1, K2) .........................................250 V, 5 A
Switching capacity..............................................1500 VA/144 W
Contact data acc. to IEC 60947-5-1
Rated operational voltage AC.................................. 250 V/250 V
Utilisation category ................................................ AC-13/AC-14
Rated operational current AC .......................................... 5 A/3 A
Rated operational voltage DC ............................... 220/110/24 V
Utilisation category..............................................................DC12
Rated operational current DC....................................0.1/0.2/1 A
Minimum current............................................... 10 mA at DC 5 V
Ordering details
Suitable measuring current transformer cores
Type Art. No.
20 mm
35 mm
60 mm
120 mm
210 mm
System components
max. connected
Type Art. No.
Accessories
Type Art. No.
USB to RS-485 interface converter B95012045
Terminal set for RCMB module (spare part) B74043124
