YWBL-WH Voltage Monitoring Relay Over-Voltage and Under-Voltage Protection Relay 35MM Guide Rail 13-17V 10-14V(DC12V) DC12V Size:DC12V Good for displaying artworks and

Good for displaying artworks and doing craftworks such as creating vinyl zip doors to keep out pests and drafts

If using water as lubricant

Master Magnetics 07502X2 Magnet Catch

10-32 x 1-Inch

YWBL-WH Voltage Monitoring Relay Over-Voltage and Under-Voltage Protection Relay 35MM Guide Rail 13-17V 10-14V(DC12V) DC12V Size:DC12V Good for displaying artworks andYWBL WH Voltage Monitoring Relay Over Voltage and Under Voltage Protection Relay 35MM Guide Rail 13 17V 10 14V(DC12V) Features: Standard modular structure, guide rail type installation Real time monitoring of dc overvoltage and undervoltage faults No additional auxiliary power supply is required Both over voltage and under voltage value can be adjusted Action time can be adjusted 2 sets of normally open and normally closed contacts 2 indicator lights