AQ-C255C Capacitor Bank Protection Device


AQ-C255C Capacitor Bank Protection Device AQ-C255C Capacitor Bank Protection Device Configure your product for inquiry Home Protection relays Capacitor bank protection AQ-C255C Capacitor Bank Protection Device Description AQ-C255C has been specifically designed for the protection of capacitor banks. It includes voltage protections in addition to the new power factor controller that functions as the control unit of an automatic capacitor bank system and can control up to five (5) capacitor banks. AQ-C255C offers a modular protection and control solution for applications that require a large I/O capacity. You can add up to eleven (11) I/O or communication modules into the device for extensive monitoring and control applications. AQ-C255C communicates using various protocols, including communication according to the IEC 61850 standard. Highlights: A large I/O capacity. Voltage-based protections. Power factor controller for up to five (5) capacitor banks. A controllable color mimic with active feedback. Power and energy measurement accuracy of up to 0.2 %. See all AQ-C255 variants Technical data Circuit breaker failure protection (CBFP; 50BF/52BF) Overvoltage (U>; 59) - 4 stages Undervoltage (U<; 27) - 4 stages Neutral overvoltage (U0>; 59N) - 4 stages Sequence voltage (U1/U2>/<; 47/27P/59PN) - 4 stages Overfrequency and underfrequency (f>/<; 81O/81U) - 8 stages Rate-of-change of frequency (df/dt>/<; 81R) - 8 stages Resistance temperature detectors (RTD) Programmable stage (PSx>/<; 99) Number of objects to control and monitor: 10 Number of indicators to monitor: 10 Number of setting groups: 8 Power factor controller (PFC) - up to 5 banks Cold load pick-up Switch-on-to-fault Phase, sequence and residual voltages (UL1, UL2, UL3, UL12, UL23, UL31, U0) Frequency (f) Voltage transformer supervision (60) Measurement recorder Measurement value recorder Event recorder (max. 15 000 permanent event records) Disturbance recorder (max. 100 records á 5 seconds at 3.2 kHz sampling) Voltage inputs: 4 Digital inputs (fixed): 3 Digital outputs (fixed): 5 Number of empty slots: 11 Digital input module (8 x DI) (optional) Digital output module (5 x DO) (optional) High-speed high-current output module (3 x out) (optional) Milliampere input module (4 x mA in, 1 x mA out) (optional) Milliampere output module (4 x mA out, 1 x mA in) (optional) RTD input module (8 RTD inputs) (optional) Arc protection module (4 x channels, 2 x HSO, 1 x BI) (optional) Communication media (see "Communication" below) External I/O modules (see "Accessories" below) Standard communication ports RJ-45 100 Mbps Ethernet (front panel, fixed) RJ-45 100 Mbps Ethernet and RS-485 (rear panel, fixed) Optional communication modules Double RJ-45 Ethernet & IRIG-B communication module Double ST Ethernet & IRIG-B communication module Double SFP Ethernet & IRIG-B communication module Double LC (HSR/PRP) Ethernet communication module Double RJ-45 (HSR/PRP) Ethernet communication module RS-232 & serial fiber communication module Communication protocols IEC 61850 (edition 1) IEC 61850 (edition 2) IEC 60870-5-101/104 IEC 60870-5-103 Modbus/RTU and Modbus/TCP DNP3 SPA AX007 External 6-channel 2-/3-wire RTD input module (pre-configured) AX008 External 8-channel thermocouple and mA input module (pre-configured) AX013 Raising frame (120 mm) AX014 Raising frame (40 mm) AX015 Wall mounting bracket AX020 SFP module (2 km, MM) AX021 SFP module (40 km, SM) AX022 SFP module (120 km, SM) Additional material Application Drawing Device Rear Image Device and Cut-out Image Order Code Download application drawing Download device rear image Download device and cut-out dimensions Download order code Download AQ 200 product catalog (IEC), v2.05 (October 2025)_WEB AQ-C255 Instruction manual (v2.14, June 2025, EN) AQtivate 200 Instruction manual, v2.04 (May 2025) Related products AQ-C215 Capacitor Bank Protection Device AQ-C215 has been specifically designed for the protection of capacitor banks. It includes capacitor bank current […] AQ-C255 Capacitor bank protection devices The AQ-C255 capacitor bank protection devices have been specifically designed for the protection of capacitor banks. […] AQ-C255A Capacitor Bank Protection Device AQ-C255A has been specifically designed for the protection of capacitor banks. It includes capacitor bank current […] AQ-C255B Capacitor Bank Control and Monitoring Device AQ-C255B has been specifically designed for controlling and monitoring capacitor banks. It includes the power factor […] Ask for an offer or more information We provide a comprehensive range of services through our own skilled staff and a global network of partners. Name(Required) First Last Country(Required) Email(Required) Add attachment Company(Required) Max. file size 300 MB Phone Add attachment Max. file size: 10 MB. Description(Required) What colour is a firetruck?(Required) To confirm you are not a robot, please answer this question. GDPR(Required) I agree to the Privacy Policy *

Description

AQ-C255C has been specifically designed for the protection of capacitor banks. It includes voltage protections in addition to the new power factor controller that functions as the control unit of an automatic capacitor bank system and can control up to five (5) capacitor banks. AQ-C255C offers a modular protection and control solution for applications that require a large I/O capacity. You can add up to eleven (11) I/O or communication modules into the device for extensive monitoring and control applications. AQ-C255C communicates using various protocols, including communication according to the IEC 61850 standard.