Doepke The experts in residual current protection technology DATA SHEET MFR pulsating AC/DC-sensitive type A Article No. 09340198 ATk Function MRCDs (modular residual current devices) consist of a combination of residual current transformer and evaluation unit. In connection with a separate external circuit-breaker, they allow the implementation of protective measure "Automatic switch-o of power supply" as per DIN VDE 0100-410 and IEC 60364-4-41. They are primarily useful when no RCCBs or CRBs can be used due to high load currents or mains voltages. The MRCD detects the residual current and evaluates it in terms of its level and duration. If the residual response current thresholds and the response time are exceeded, it activates a separate switch-o device that disconnects the system part for which it is responsible from the power supply. Modular residual current circuit-breakers from the MFR series have a compact design and an increased rated voltage of up to 500 V AC. The residual response current level is determined by the corresponding transformer selected for this series. The devices also have two potential-free NO contacts for controlling the switch-o device. Modular protective devices with residual current characteristic A detect sinusoidal AC currents as well as pulsating DC residual currents. Devices in the standard design are intended for monitoring circuits with a rated voltage of 230 V or 400 V and a rated frequency of 50 Hz or 60 Hz. Features suitable for detecting type A and AC residual currents as well as pulsating DC residual currents at 50-60 Hz, connection for external residual current transformer series MFIW, rated residual currents are determined by the transformer, compact design, 2 potential-free contacts, opening when trip occurs, high immunity against transient residual currents Mounting quick fastening to mounting rail, any installation position Applications The monitoring device is suitable for use in power supplied to purpose-built buildings and industrial facilities with TN-S, TN-C-S networks and IT networks, such as in server rooms for data centres, laboratories, in the automotive industry and in conjunction with air conditioning systems, printing machines and packaging machines, Not permitted for use in TN-C networks and direct current networks; not permitted for monitoring systems in which electronic equipment may cause DC residual currents or residual currents with frequencies not equal to 50 Hz. Notes If residual currents with frequencies ≠ 50/60 Hz are expected (multiphase operated electronic equipment such as frequency converters), correct display and indication of a 50/60 Hz residual current cannot be guaranteed. For these applications we recommend our AC/DC sensitive residual current control relays from series DMRCD type B+. Accessories DHi 11, MFIW 035/0,3, MFIW 035/0,5, MFIW 070/0,3, MFIW 070/0,5, MFIW 105/0,3, MFIW 105/0,5, MFIW 140/0,3, MFIW 140/0,5, MFIW 035/1,0, MFIW 070/1,0, MFIW 105/1,0, MFIW 140/1,0 Technical Data Series Error memory existent Short-time delayed Residual operating current I∆n (settings) Frequency range response residual current Type A Frequency range response residual current Type AC Adjustment values delay at IΔn ≥ 30 mA Response time (textual) Rated voltage Un of circuit monitored MFR MFR false true 0.3 A, 0.5 A, 1 A 50 Hz 50 Hz 0s < 40 ms (at rated residual current) 199 V ... 500 V

The experts in residual current protection technology

Wiring example The experts in residual current protection technology