The SR3B261BD is a Zelio Logic Modular Smart Relay with local display. It checks program memory on each power up. It features common mode analogue inputs, reverse polarity protection, resistive discrete input and 3-wire proximity sensors PNP (discrete input) input compatibility. It is approved by EN/IEC 60068-2-27 Ea, EN/IEC 60068-2-6 Fc, EN/IEC 61000-4-11, EN/IEC 61000-4-12, EN/IEC 61000-4-2 level 3, EN/IEC 61000-4-3, EN/IEC 61000-4-4 level 3, EN/IEC 61000-4-5 and EN/IEC 61000-4-6 level 3 standards.