EOCR 3DE / 3EZ – Digital Motor Protection Relay

Concord EOCR · Motor Protection

Concord’s digital motor protection relays for three-phase motors. The digital display works as an ammeter showing actual motor current, and as a diagnostic display showing the cause of every trip – helping you troubleshoot quickly and cut downtime. One model covers motors from 0.5 A to 600 A (with external CTs), drastically reducing inventory. The 3EZ adds ground-fault protection with a ZCT.

Overcurrent – recommended range	Definite-time 0.5–80 A (above 80 A use external CT); inverse-time 0.5–32 A (32 A and above use external CT)
Low current – recommended range	0.5 A to overcurrent setting, or OFF
Operational time characteristic	Definite / thermal inverse
Manoeuvre delay time	0–200 s
Overcurrent definite-time operation	0.2–30 s
Inverse-time characteristic curve	Class 1–30

⬇ Datasheet (PDF)Request a Quote Brochure (PDF)Call +91 96670 40511

For large motors, use with Concord current transformers; for ground-fault protection on the 3EZ, use a CBCT (ZCT).

Rating Specifications

Overcurrent – recommended range	Definite-time 0.5–80 A (above 80 A use external CT); inverse-time 0.5–32 A (32 A and above use external CT)
Low current – recommended range	0.5 A to overcurrent setting, or OFF
Operational time characteristic	Definite / thermal inverse
Manoeuvre delay time	0–200 s
Overcurrent definite-time operation	0.2–30 s
Inverse-time characteristic curve	Class 1–30
Undercurrent operation time	0.5–30 s
Automatic reset time	0.5 s–20 min
Supply voltage	100–240 V AC/DC (85–110%, free voltage), 24 V AC/DC
Frequency	50/60 Hz
Power consumption	7 VA
Output contact capacity	3 A / 250 V AC resistive load
Output configuration	Overcurrent: 1a1b; warning and undercurrent
Display	7-segment LED: 3-phase current, trip cause, settings
Bar graph	Load factor display, 65–100%