Mueller Electric Company Monitor - Relay Output VBA-120-ALA

The VBA Series is a single-phase voltage band monitor designed to protect equipment by de-energizing a relay when supply voltage falls outside preset under and over limits, then automatically resetting when conditions normalize. The VBA-120-ALA variant is a 120 VAC model with a pickup under voltage of 90-120 VAC, pickup over voltage of 120-150 VAC, and a hysteresis of 5 VAC. It features a Style A DPDT relay output rated at 5 A at 240 VAC resistive or 211 VA at 240 VAC. The unit operates on 5 VA maximum power, responds in approximately 50 ms, and functions within a temperature range of 32°F to 131°F (0°C to 55°C). Weight is 5 oz. The part number VBA-120-ALA is not explicitly listed, but the VBA-120-A*A series is documented; the 'LA' suffix aligns with adjustable settings using a knob and locknut, consistent with the 'K' and 'L' modification codes in the series.