19mm power switch lock, also known as Chicago lock, zinc alloy die cast housing and cylinder, bright chrome plated standard, double-bitted brass flat key, 11 disc tumbler mechanism, 5 number changes available, a variety of terminal changes. Two-stage switch design, the switch function OFF-ON (SPST), the key can be pull out at 12 o'clock position only, or can be withdrawn at 12 o'clock and 3 o'clock two positions, S203 is a screw terminal foot, S203A is a flat terminal foot, S203B is a cylindrical terminal foot, and there is another spring load for momentary contact and key return at 3 o'clock instantaneous power return, only 12 o'clock out. According to customer needs to increase the processing process, such as: welding wire, thunder carving, marking, etc. Based on convenient production quantity, it can also be customized according to customer needs. Contact rating: 4A 125VAC, contact resistance: 50 Milli-Ohms Max, Insulation resistance: 500 Meg-ohms Min.(500VDC). Dielectric strength: 1500VAC-1 Minute, passed life cycle test of 6,000 times and UL approval, ROHS and REACH compliant suitable to use on contact of control panel, instrument equipment, charging meter and burglarproof device.