Easy and flexible installation without any mechanical effort can be locked to prevent unexpected machine shutdown Sturdy metal housing for harsh environments integrated transponder coded security technology High Security (Class 4 / PLe) All in the Master - Security System ESL EUCHNER's ESL Security System is a multifunctional door handle designed to protect and monitor gatekeepers, such as doors and backstops on machines and devices. It consists of a handle and an interlocking module, equipped with a proven transponder coded security engineering CES. According to EN ISO 13849-1 (Category 4 / PLe), the use of transponder technology ensures greater security and provides excellent tamper protection. Up to 20 security system ESL or other EUCHNER AR version products can be connected in series using the installed CES AR evaluation electronics. ESL is equipped with two easily observed LED indicators to indicate status for quick diagnosis.