EATON EMT6-KDB Motor Protection Relay

(Nro. de orden: 269471)

Tipo de producto: Thermistor (PTC) Relé de protección del motor, Ex Explosion-proof, Dual Sensor Circuit

Eaton Moeller EMT6 series for PTC thermistor temperature monitoring of motor windings.

K = ATEX explosion-proof certification; DB = Dual sensor input circuit

✅ Explicación del código del modelo

EMT6: Serie, PTC thermistor motor protection relay

k: ATEX certified, suitable for Ex e explosion-proof motor applications

DB: Two independent PTC sensor input circuits (simultaneously monitor 2 temperature points, p.ej. estator + bearing, or pre-alarm + viaje)

Código de pedido: 269471

✅ Key Features

Dual PTC circuit monitoring, two sensor channels evaluated independently to support pre-warning and protection logic
Sensor wire break and short-circuit detection (unique to K variants: detects not only wire breakage but also short circuits of sensor cables)
Zero-voltage safety protection (undervoltage lockout): the relay will not auto-reset after tripping due to power loss; configurable via DIP switch
Resettable modes: local manual reset / reinicio remoto
Front panel Test/Reset button for commissioning to simulate over-temperature faults
LED de estado: power indication, indicación de falla
SIL 1 nivel de seguridad (TU ÚNICO 50495), suitable for temperature protection of explosion-proof equipment

✅ Electrical Specifications

Tensión de alimentación: 24～240V AC/DC wide range

Contacto auxiliar: 1NO + 1CAROLINA DEL NORTE (contacto de cambio), rated thermal current 6A

Sensor type: PTC thermistor (130℃ / 150℃ PTC embedded in motor windings)

Thresholds: Over-temperature trip >1330Oh; reiniciar <550Oh; sensor short-circuit fault <50Oh

Montaje: DIN rail snap-on mounting, width 22.5mm

Terminales: Terminales de tornillo, tightening torque 1.2Nm

Protección del recinto: IP20 (solo para instalación en gabinete)

Temperatura ambiente: Operating -25℃ ~ +60℃ (máximo. +45℃ for tightly sealed cabinets)

Estándares: CEI/EN 60947-8, ATEX, CE, UL, Certificación CCC

✅ Applications

Winding temperature protection for Ex-e increased safety explosion-proof motors (primary use case for K models)

Temperature protection for motors, gearboxes, pumps and fans via PTC thermistors

Dual-point temperature monitoring: p.ej. one channel for winding over-temperature trip, one channel for bearing pre-alarm

Thermal protection for equipment in chemical, farmacéutico, coal and other explosion hazardous areas

✅ Comparison of Related Series Models

Modelo	Número de pedido.	No. of Circuits
EMT6-K	269470	Soltero
EMT6-KDB	269471	Dual
EMT6-DB	66167	Dual
EMT6-DBK	66168	Dual

✅ Troubleshooting Guide

No LED on power-up: Check supply voltage 24~240V AC/DC
Fault LED steady ON:

PTC over-temperature (resistencia >1330Oh)

Sensor circuit wire break

Sensor cable short-circuit (KDB exclusive detection function)

Cannot reset after trip: Zero-voltage lockout is activated; power cycle or disable undervoltage lockout via DIP switch
Test function: Press front Test button to simulate over-temperature and trigger relay trip

✅ Alternative Selection Reference

Same brand alternative: EMT6-DBK (without ATEX explosion-proof certificate, other functions similar)

Alternativa doméstica: Domestic dual-channel PTC motor protection relay (nota: for explosion-proof applications, domestic alternative must provide valid ATEX certificate for direct replacement of EMT6-KDB)

EATON EMT6-KDB Ambient Temperature Specifications

Open ventilated cabinet operating ambient temperature: -25°C ~ +60 °C
Sealed cabinet installation (mala disipación de calor): -25℃ ～ +45℃ (reduced upper limit)
Temperatura de almacenamiento: -45℃ ～ +85 ℃

Notas complementarias:

Under UL/CSA certified operating conditions, the nominal rated ambient temperature on nameplate is 40℃

For ATEX explosion-proof applications, ATEX code ambient limits must be followed, not solely the 60℃ upper limit

EATON EMT6 Full Series Model List (PTC Thermistor Motor Protection Relay)

Abbreviation Definition

k: ATEX explosion-proof certified, supports sensor cable short-circuit detection

DB: Dual PTC sensor circuit

EMT62: Dual normally open contact version

(230V): Fixed 230V AC supply; no suffix = wide voltage 24~240V AC/DC

Modelo	Número de pedido.	Sensor Circuits	Fuente de alimentación	Descripción
EMT6	66166	Soltero	24~240 V CA/CC	Modelo básico, no short-circuit detection, non-explosion-proof
EMT6(230V)	66400	Soltero	230V y	Single circuit, fixed 230V power supply
EMT6-DB	66167	Dual	24~240 V CA/CC	Dual circuit, no short-circuit detection, non-explosion-proof
EMT6-DB(230V)	66401	Dual	230V y	Dual circuit, fixed 230V power supply
EMT6-DBK	66168	Dual	24~240 V CA/CC	Dual circuit with sensor short-circuit detection, no ATEX
EMT6-K	269470	Soltero	24~240 V CA/CC	Single circuit, ATEX certified, with short-circuit detection
EMT6-KDB	269471	Dual	24~240 V CA/CC	Dual circuit + ATEX + short-circuit detection (target model)
EMT62	171889	Soltero	24~240 V CA/CC	Single circuit, dual NO output contacts
EMT62-DB	171890	Dual	24~240 V CA/CC	Dual circuit, dual NO output contacts

Guía de selección rápida

Zona con riesgo de explosión (Ex-e motor) → EMT6-K / EMT6-KDB
Industria general, require sensor cable short-circuit detection → EMT6-DBK
Industria general, dual temperature monitoring, short-circuit detection not required → EMT6-DB
Two independent normally open alarm outputs required → EMT62 / EMT62-DB

EATON EMT6-KDB (Order No.269471) Dimensiones físicas

DIN rail mounted; housing dimensions identical across all EMT6 variants

Ancho(W.): 22.5 milímetros (nominal 23mm, standard 22.5mm DIN rail module width)

Altura(h): 83 milímetros

Profundidad(D): 103 milímetros (measured from DIN rail mounting surface to front face)

✅ Weight: 0.13 kg approx.

Observaciones: