16mm XA Series 22mm XW Series SEMI S2 Compliant EMO Switches and Switch GuardsSame dimensions for any number of contacts Same dimensions for any number of contacts 16mm XA Series / 22mm XW Series SEMI Emergency Off (EMO) Switches New XA and XW series emergency stop switches are now available with EMO markings. When used in combination with switch guards ensures compliance to SEMI S2 standards. < Structure and Features > 16mm XA Series 22mm XW Series WWorld sorld s World s World s Up to four contacts Shortest for four-contact type ShortestShortest First First Only 27.9 mm deep behind the Only 48.7 mm deep behind panel for any number of contacts the panel for any number of contacts, reducing space. 48.7 mm 27.9 mm Safe Break Action Safety Potential Structure 3rd-generation 2nd-generation WWorld sorld s (Safety Potential Structure) When the contact block is detached from the FirstFirst operator, the NC contact opens (OFF). Normal Status Latched Normal Status Latched Detaching the Contact Block 123 4 Operator NC NC contacts: NC NC contacts: contacts: OFF contacts: OFF ON ON (machine (machine (machine cannot (machine can operate) cannot operate) can Contact operate) operate) Block Closed ON Open (OFF) When the contact block is detached from the operator, the cam directly opens the NC main contacts (contacts are off). Direct Opening Action All normally closed contact elements of an emergency stop devices shall have Normal Status Latched Normal Status Latched a direct opening action (positive opening action), according to annex K of IEC 60947-5-1. (IEC 60947-5-5 5.2) NC contacts: NC contacts: OFF Achievement of contact separation (of a contact element) of the switch actuator ON (machine (machine cannot through non-resilient members (for example not dependent upon springs) (IEC can operate) operate) 60947-5-1 Annex K) With the XA and XW emergency stop switches, the potential energy level of the Safety Lock Mechanism latched status is lower than that of the normal status. In the event the contact block is damaged due to excessive shocks, the NC contacts will turn off, thus leading to safety The emergency stop signal shall be maintained until the emergency stop device by stopping the machine. is reset (disengaged). (IEC 60947-5-5 6.2) 2 Energy Low High Energy Low High