Feature: ['The ES-FA-11AA is a 3-pole Safety Module. 2NO-1NC contact configuration. AgNi 5\\u03bcm gold-plated contact. Monitors emergency stop devices, such as palm buttons and rope/cable pulls and positive-opening safety switches used for guard/gate interlocking. Plug-in terminal blocks. A 24VDC source switched by hard/relay contacts in single-channel hook-up. Hard/relay contacts in a dual-channel hook-up using terminals S11-S12 and S21-S22'] (Page 1)