標準號：SIS SS EN 50 047-1989
中文標準名稱：工業用低壓成套開關設備和控制設備．控制開關．座席開關30x55 —尺寸和特點
英文標準名稱：Low-voltage switchgear and controlgear for industrial use —Control switches —Position switches 30x55 —Dimensions and characteristics
發布日期：1989/9/13 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：This standard applies to certain position switches with automatic return actuator for industrial use, the standardized dimensions of which and the charac-teristics necessary for their application are given below.A larger size (42,5 x 80) is standardized in EN 50 041.Electrical characteristics shall conform to those of IEC Publication 337 - Control switches.This standard includes the four following types:roller lever (form A), rounded plunger (form B), plunger with roller (form C), roller lever arm (form E).The devices are fitted with either snap action designated(1) in clause 3, or slow make and break, designated (2) in clause 3, mechanisms.