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Power Engineering Class II (T2) Surge Arresters, leakage-current free EnerPro 280Tr • Very space-saving installation! • Only 1 modular width instead of 2 • Two-pole high performance surge protector for 230/400 V • Function control indication via LED • 2+1 circuit The SPD modules have thermal disconnection devices per pole, which respond if, due to an overload, the partial lightning current through the metal oxide varistor exceeds a certain value. In this case the green LED extinguishes and the optional thermal sensor with remote contact (normally closed) opens. In order to maintain the surge voltage protection the SPD has immediately to be replaced. The thermally triggered, potential-free remote alarm contact is a hermetically sealed switch to eliminate environmental influences and to guarantee the highest possible security. For security reasons it is designed as a normally closed contact (NC). The MOV and the expulsion-type spark gap are connected in series to avoid heating and, thus, ageing in the state of rest. Therefore, a considerable increase in life expectancy is reached. Thus, the protection modules do not need to be pluggable. The SPD is equipped with a reliable LED function display in place of a mechanical display. The LED has a dual function as indicator for the varistor function and as voltage monitor. Therefore, a proper connection and function of the SPD is indicated during installation. Additionally, an extinguished LED during operation indicates a malfunction. The optional remote alarm contacts are placed in the housing. For the electrical connection twisted cables are attached to screw-type terminals at a terminal fixing of the SPD. Since this SPD version is leakage current-free, the earthing system is protected against dangerous ac-caused corrosion and the earth leakage circuit-breaker will not be activated by leakage currents. Versions with additional gas-discharge spark gaps do not interfere with the function of permanently installed insulation monitoring devices and earth leakage circuit-breakers. This compact SPD with a modular width of only 1 MW is designed for single-phase TN systems with backup fuses up to 125 A. A single protection unit can protect two conductors (against PE or N) or one conductor and the neutral conductor (against PE). The arrester has only half the width of standard protective devices. The EnerPro 280Tr is equipped with a thermal disconnection device, which is triggered if due to an overload (high leakage currents) the varistor temperature rises too much. In this case the green function control indication extinguishes and the optional remote contact opens. In order to maintain the surge voltage protection the SPD has immediately to be replaced. In 230 V ac networks the optional potential-free remote contact (FM) can be updated by an additional acoustic/optical signalling device UAS 230-Tr with test key (Item no. 35 10 30), even at a later point in time. 84 Leutron GmbH · Humboldtstrasse 30 · 70771 Leinfelden-Echterdingen · Germany · Phone +49 711 94771-0 · www.leutron.de
Power Engineering Class II (T2) Surge Arresters, leakage-current free EnerPro 280Tr EnerPro 280Tr Slim and Leakage-current free 2-pole surge arrester, e.g. for a 1-phase TN system. Only 1 MW according to DIN 43880. • Optional remote signalling contact (PK) • Monitoring of conductor and arrester Technical Data EnerPro 280Tr Nominal alternating voltage (UN) 230/400 V~ Max. continuous direct voltage (Uc) 275/480 V Max. acceptable fuse or back-up fuse 125 A gL/gG A Protection level at 5 kA (Up) ≤ 1.0 kV Protection level at In {L(N)-PE} (Urest) ≤ 1.4 kV Response time (tA) ≤ 50 ns Nominal discharge current (8/20 µs) {L(N)-PE} (In) 15 kA Critical discharge current (8/20 µs) (Imax) 18 kA Operating temperature range (TU) -40 – +80 °C Enclosure material / colour polycarbonate (halogen-free) UL94-V0 / yellow Casting compound polyurethane Mounting on 35 mm DIN rail (DIN EN 50 022) Net weight / pc 110 g Basic circuit diagram Order Data Product EnerPro 280Tr Ordering part no. 38 20 28 Technical Data and Order Data EnerPro 280Tr/Pk FM contact / contact type break contact Switching capacity 250 V/2 A Product EnerPro 280Tr/Pk Ordering part no. 38 20 29 Leutron GmbH · Humboldtstrasse 30 · 70771 Leinfelden-Echterdingen · Germany · Phone +49 711 94771-0 · www.leutron.de 85
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