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1 Across the line contactors Low Voltage Products & Systems 1.27 ABB Inc. • 888-385-1221 • www.abb.us/lowvolt

Specifications
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Content	1 Across the line contactors Low Voltage Products & Systems 1.27 ABB Inc. • 888-385-1221 • www.abb.us/lowvoltage 1SXU000023C0202 A1 A2 Varistor (only) General The operation of inductive circuits causes overvoltages, in particular on opening of the contactor coil. The electromagnetic energy stored by the coil during contactor closing is restored on opening in the form of surges, the slope and amplitude of which may rise to several kilovolts. A number of drawbacks are observed ranging from interference on the electronic devices to breakdown of insulators and even destruction of certain sensitive components. The graph opposite reproduces the oscillogram showing voltage discharges at the terminals of a 42V/50Hz coil without peak clipping. The coil was switched by 8 series-connected poles of a contactor relay. Following a burst of discharges with a very steep slope a damped oscillation emerges with a peak value of 3500V. Overvoltage factor The overvoltage factor k is deﬁned as the ratio of the maximum overvoltage peak value Ûs to the peak value Ûc of the coil rated control voltage Uc: Ûs max. Ûs max. Ûs max.k = _______ in DC: k = _______ or in AC: k = _______ Ûc Uc Uc√2 3500For example the following is obtained for the above graph: k = _____ ≈ 60 42 √2 Surge suppressors To guard against the harmful effects of these overvoltages, ABB has developed a range of surge suppressors designed to reduce the k factor deﬁned above and to limit or even completely eliminate the high pre-damping voltage frequencies. Each case is different, but the technical data tolerances and the generous sizing of parts have enabled us to reduce the number of variants. We have chosen the following solutions: transil diodes, varistors and RC blocks. Note: A varistor is a resistor whose value increases to a very large extent when a certain voltage is applied at its terminals. Wiring diagrams General technical data The housings and impregnation resins of the surge suppressors are made of ﬂame-resistant materials in accordance with the UL 94 standard. These systems are not polarized, i.e. d.c. operated devices do not have to be connected in a speciﬁc direction. • Operating temperature: -20 to +70 °C • Connection to the coil terminals (parallel mounting) – For RT 5, RV 5, RC 5-1 and RC 5-2: clip-on for both ﬁxing and connection. • Mounting: – RT 5, RV 5 and RC 5: clipped onto the top part of the contactor base. This mounting method prevents any projections and change in contactor dimensions. – RC-EH: glued to the top part of the contactor base. Accessories Surge suppressors for A/AE/AL/EK contactors General information 0 1000 100 U (V) T (µs) 0 1000 100 A1 A2 Transil diode A1 A2 RC type A1 A2 U Varistor + RC
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Following Datasheets	1SXU132081B0202 (2 pages) 1TFC902001B0201 (12 pages) 1TFC902006B0201 (8 pages) 1TFL_315_012 (12 pages) 1TFL_321_000 (1 pages) 1TFL_321_450-FE (5 pages) 1TGC900009B0201_MNS_Safety_Aspects (24 pages) 1TGC901007B0202 (53 pages) 1TGC901012L0201 (4 pages) 1TGC901013M2902_MPU_Installation_Sheet (2 pages)
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