Monitoring technique Phase sequence relay BA 9041, AI 941 N varimeter According to IEC 255, EN 60 255, VDE 0435 part 303 Detection of wrong phase sequence 1 or 2 changeover contacts Width 45 mm BA 9041 AI 941 N Function diagram Approvals and marking U L1 t Application U Monitoring three-phase mains for incorret phase sequence L3 L2 Function U The phase sequence relays BA 9041 and AI 941N monitor the right order L2 of the phases in a 3-phase system. When all 3 phases are connected to L3 the device and the phase sequence is correct the output contacts are activated, 11-14 and 21-24 close and a green LED comes on. When the voltage in one phase drops below 60 % of the nominal voltage 11-14 the relay is deenergised. If a load feeds back a voltage that is higher then 11-12 60 % U the fault is not detected. To avoid this problem an asymmetry N M5743 c relay BA 9040 should be used. In systems with commutation peaks (thyristor controlled drives) the Circuit diagram device can falsely detect a phase failure. L1 L2 L3 11 21 In this case it is helpful to know as much as possible about the actual conditions in the system. L1 11 21 Technical data Input 12 14 22 24 L3 L2 Nominal voltage U : 3 AC 190, 230, 400, 415, 440, 500 V N 12 14 22 24 M7518 Voltage range: 0,8 ... 1,1 U N Nominal frequency of U : 50 Hz (60 Hz on request) N BA 9041, AI 941 N.002 Frequency range: 5 % Nominal consumption: < 3,5 VA Output Contacts AI 941 N.001: 1 changeover contact AI 941 N.002, BA 9041: 2 changeover contacts Operate-/release delay: < 100 / < 50 ms Thermal current I : 5 A th Switching capacity to AC 15 NO contact: 3 A / AC 230 V EN 60 947-5-1 NC contact: 1 A / AC 230 V EN 60 947-5-1 Electrical life EN 60 947-5-1 5 to AC 15 at 3 A, AC 230 V: 2,5 x 10 switching cycles Short-circuit strength max. fuse rating: 4 A gL EN 60 947-5-1 6 Mechanical life: 50 x 10 switching cycles All technical data in this list relate to the state at the moment of edition. We reserve the right BA 9041, AI 941 N / 11.10.01 d for technical improvements and changes at any time. 1 0225150Technical data General data Operating mode: Continuous operation Temperature range: - 20 ... + 60 C Clearance and creepage distances overvoltage category / contamination level: 4 kV / 2 IEC 60 664-1 EMC Electrostatic discharge: 8 kV (air) EN 61 000-4-2 HF irradiation: 10 V/m EN 61 000-4-3 Fast transients: 2 kV EN 61 000-4-4 Surge voltages between wires for power supply: 1 kV EN 61 000-4-5 between wire and ground: 2 kV EN 61 000-4-5 Interference suppression: Limit value class B EN 55 011 Degree of protection: Housing: IP 40 EN 60 529 Terminals: IP 20 EN 60 529 Housing: Thermoplastic with V0 behaviour according to UL subject 94 Vibration resistance: Amplitude 0,35 mm, frequency 10 ... 55 Hz, EN 60 068-2-6 Climate resistance: 20 / 060 / 04 EN 60 068-1 Terminal designation: EN 50 005 2 Wire connection: 2 x 2,5 mm solid or 2 2 x 1,5 mm stranded wire with sleeve DIN 46 228-1/-2/-3/-4 Wire fixing: Flat terminals with self-lifting clamping piece EN 60 999 Screw mounting: AI 941 N: 35 x 50 mm and 35 x 60 mm Mounting: DIN rail EN 50 022 Weight: BA 9041: 310 g AI 941 N: 300 g Dimensions Width x height x depth BA 9041: 45 x 74 x 124 mm AI 941 N: 45 x 77 x 127 mm Standard types BA 9041 AC 400 V 50 Hz Article number: 0041732 stock item Output: 2 changeover contacts Nominal voltage U : AC 400 V N Width: 45 mm AI 941N.001 AC 400 V 50 Hz Article number: 0040771 stock item Output: 1 changeover contact Nominal voltage U : AC 400 V N Width: 45 mm Variant AI 941 N. /03: Nominal frequency 50 ... 60 Hz, phase failure cannot be detected with this unit Ordering example for Variants BA 9041 AC 400 V 50 Hz Nominal frequency Nominal voltage Type AI 941 N .001 / AC 400 V 50 Hz Nominal frequency Nominal voltage Variant, if required Contacts Type E. DOLD & SHNE KG D-78114 Furtwangen Postf. 1251 Tel. +49 7723 654 0 Telefax +49 7723 654 356 e-mail dold-relays t-online.de internet