Littelfuse SymCom 77C-LR-KW/HP Series PumpSaver.

Littelfuse SymCom 77C-LR-KW/HP PumpSaver is a single-phase current and voltage monitor that provides protection with voltage from 100–240 VAC and motor full load ampere range of 1–9 A (external CTs required above 9A).

The 77C-LR-KW/HP Model has important advantages over current monitors in many protection applications. Any motor load that has a small or very non-linear change in current vs. load requires the use of a power monitor for under-load, dry run and dead-head protection. The change in power vs. load is more linear for most motor loads and is greater in magnitude than the change in current in all motor loads. This is because power measurements take into account both power factor (pf) and current.

Small motors, those under 3 hp and especially fractional horsepower, exhibit small changes in current vs. load, but the change in power is large. When larger motors are de-rated (run below their rated horsepower) the change in current is small vs. load, but again, the change in power is large and linear. Other typical applications include slower speed mixer or agitator motors up to 50 hp and beyond. These motors and others that run slower than around 3400 rpm usually have small current changes vs. load.

Magdrive and can pumps tend to be small horsepower, positive displacement type pumps. These pumps need the high sensitivity of a power monitor to protect them from dry run using the under power feature and dead-head conditions using the under power feature if the motor decouples from the pump, and the overpower feature if the motor does not decouple.

The built-in UL Listed/CSA approved overload, current unbalance, reverse phase, single-phase and other protection features are significant benefits over similar products. The Modbus communications capability allows this device to be directly integrated with the SymCom RM-1000 and RM-2000 remote displays or other remote monitoring and control equipment.

Protects Single-Phase Motors From:
• Overload
• Underload
• Jams
• Low Voltage
• High Voltage
• Rapid Cycling

Other Features:
• Automatic or manual reset, remote reset
• Tamper guard
• Alphanumeric LED diagnostic display
• Last fault memory
• Compact design saves precious panel space
• Digital programmability permits precise customization
• Remote reset
• RS485 communication port (with pn RS485MS-2W)

Disclaimer Notice: Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.