The Weidmuller 1775540000 ZDU 1.5/3AN BL is an under-voltage release with a short-release time. It is a 1 pole, 24-240V DC/AC plug-in mounting device with a manual-reset feature. The short-release time can be adjusted via an integral potentiometer, while the manual reset feature allows the instantaneous release of the under-voltage switch. It also has a LED indicator for a visual indication of voltage status. The ZDU 1.5/3AN BL is a highly reliable, dust-protected device suitable for switchgear, control systems and in power supply applications.