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ECSTD Series CurrentWatch AC current switches

The CurrentWatch ECSTD Series is a family of high-performance current-operated switches with field-adjustable time delay to help minimize nuisance trips during start-up and operation.

Designed for motor status applications where set point accuracy and repeatability are critical, the ECSTD Series offers a linear set point characteristic and constant hysteresis.

Standard features include self-powering, jumper-selectable ranges and a choice of outputs and housing styles. 

ECSTD Series CurrentWatch AC current switches

ECSTD Series CurrentWatch AC current switches core features

  • Adjustable start-up/delay timer—field adjustable from 0 to 15 seconds to eliminate nuisance alarms due to start-up inrush or temporary overcurrent conditions
  • Choice of NO/NC AC or universal outputs—contact ratings of 1.0 A at 240 Vac or universal outputs of 0.15 A at 240 Vac/Vdc (NO models) and 0.2 A at 135 Vac/Vdc (NC models) for use with most standard motor control systems
  • Improved ease of installation and use—self-powered, split-core models simplify installation, 1.0 A AC rating eliminates need for time delay relay, and status LED provides visual indication of set point trip and contact action

Applications in which the ECSTD Series current switches excel

  • Motor protection—serves as an electronic proof-of-operation; detects current draw changes in motors when they encounter problems such as pumps running dry or pending bearing failure; non-intrusive and less expensive to install than differential pressure flow sensors or thermal switches
  • High inrush or temporary overload current—adjustable start-up/delay timer allows 0–15 second delay to eliminate nuisance trips from high inrush or short overload conditions
electric motor core

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