Sensors and limit 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.

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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

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ECSTD Series CurrentWatch AC current switches