Littelfuse ECSW Series

6 variants · LittelfuseAll General Purpose Relays →

About the Littelfuse ECSW Series

The Littelfuse ECSW Series series groups 6 related part numbers, each listed with full specifications, a datasheet where available, and an RFQ option. Every variant in the range shares a common mounting of Chassis Mount, output signal of Relay and package of Bulk. Variants differ by delay time, supply voltage and trip range, so you can match the exact delay time your application requires using the selection guide below. All listed Littelfuse ECSW Series part numbers are active and orderable.

Select a variant by

Delay time: 0.15 Sec to 7 Sec · 0.5 Sec to 50 Sec
Supply voltage: 24 VAC · 120 VAC · 230 VAC
Trip range: 0.5–5 A AC · 2–20 A AC · 5–50 A AC

Shared specifications

Mounting: Chassis Mount
Output signal: Relay
Package: Bulk
Product type: Current Sensing AC
Temp operating max: 60 °C
Temp operating min: -40 °C

Variant comparison

Parameter	ECSW3LABT	ECSW4HBHT	ECSW4LADT	ECSW4LBHT	ECSW4MACT	ECSW6MBHT
Delay time	0.15 Sec to 7 Sec	0.5 Sec to 50 Sec	0.15 Sec to 7 Sec	0.5 Sec to 50 Sec	0.15 Sec to 7 Sec	0.5 Sec to 50 Sec
Supply voltage	24 VAC	120 VAC	120 VAC	120 VAC	120 VAC	230 VAC
Trip range	0.5–5 A AC	5–50 A AC	0.5–5 A AC	5–50 A AC	2–20 A AC	2–20 A AC

Request a quote on any Littelfuse ECSW Series part number and we confirm price, availability and lead time per line — including end-of-life and allocation-constrained variants.