Low Cost Hour Meter Features • UL Listed, CE Certified • Low Cost • 7 Digit Display (99999.99 Hours) • AC or DC Voltages • Small Case Spring clip AH57 (Base Mount) & DIN Rail Mount 1.92 (48.5) EXAMPLE: H57 24VAC Series H57 = Panel Mount AH57 = Base Mount H57.55 = Extended 2.16" x 2.16" Bezel for 2" diameter cutout H57.72 = Extended 2.83" x 2.83" Bezel for 2" diameter cutout Voltages 12, 24, 36, 80, 110 VDC 24, 40,110, 220, 440 VAC Frequency (AC units only) 50 or 60Hz (Specify) Accessories DR-4 = 4 DIN Rail (DIN 46277) Specifications: Termination: Flat tabs .031 x .250" with screw terminal Voltages: 24, 110, 220, 440 VAC +15%, 50 Hz or 60Hz 12 to 24, 36 to 80, 110 VDC ± 10 % Test Voltage: 2000V, 50 Hz Ambient temperature: -15° to +50°C on AC; -20° to +60°C on DC Power Consumption: Appr. 2 VA at 220 VAC; Appr. 180 mW at 12 VDC Hour range: AC Units: 99999.99 hours DC Units: 999999.99 hours Height of Figures: 4 mm Color of Figures: Hours: white on black, Decimals: red on black Color of Housing: Black Operation indicator: Fast rotating, white Approvals: UL Listed: File # E128604X, CE Approved Weight: AH57: 84g; H57 48g Description: These meters are mainly used for monitoring the running time of machines, apparatus and instruments as well as for recording maintenance time, warranty time or rental use time. A synchronous motor operating through a gear train drives the number wheels for the display of full hours 1/10 h and 1/100 h. On AC-versions, the main supply (50 or 60 Hz) is used as frequency standard. On DC-versions the exact frequency generated by means of a quartz crystal. A rugged and completely insulated plastic housing provides substantial protection against environmental