with text 'Door open' (vertical mounting)
for control switches item no.: 506 KOU, 502 KOU, 503 KOU, 506-20 KOU, 502-20 KOU
for push button control switches item no.: 506 KOTU, 502 KOTU
for illuminated buttons item no.: 531 U, 533 U, 533-2 U, 534 U
IP 44 installation only possible in 3-gang frames!