EATON EMT6-KDB Motor Protection Relay

(Pedido nº.: 269471)

Tipo de produto: Thermistor (PTC) Motor Protection Relay, 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

✅ Model Code Explanation

EMT6: Série, PTC thermistor motor protection relay

K: Certificado ATEX, suitable for Ex e explosion-proof motor applications

BD: Two independent PTC sensor input circuits (simultaneously monitor 2 temperature points, por exemplo. estator + bearing, or pre-alarm + viagem)

Código do 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 / reinicialização remota
Front panel Test/Reset button for commissioning to simulate over-temperature faults
LEDs de status: power indication, indicação de falha
SIL 1 nível de segurança (SEU 50495), suitable for temperature protection of explosion-proof equipment

✅ Electrical Specifications

Tensão de alimentação: 24～240V AC/DC wide range

Contato auxiliar: 1NÃO + 1NC (contato de mudança), rated thermal current 6A

Tipo de sensor: PTC thermistor (130℃ / 150℃ PTC embedded in motor windings)

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

Montagem: Montagem de encaixe em trilho DIN, largura 22,5 mm

Terminais: Terminais de parafuso, tightening torque 1.2Nm

Enclosure protection: IP20 (apenas para instalação em gabinete)

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

Padrões: IEC/EN 60947-8, ATEX, CE, UL, Certificação 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: por exemplo. one channel for winding over-temperature trip, one channel for bearing pre-alarm

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

✅ Comparison of Related Series Models

Modelo	Número do pedido.	Não. of Circuits
EMT6-K	269470	Solteiro
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 (resistência >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
Função de teste: 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 (observação: 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℃ ~ +60 ℃
Sealed cabinet installation (má dissipação de calor): -25℃ ～ +45℃ (reduced upper limit)
Temperatura de armazenamento: -45℃ ~ +85℃

Notas Suplementares:

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

BD: 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 do pedido.	Sensor Circuits	Fonte de energia	Descrição
EMT6	66166	Solteiro	24~240V CA/CC	Modelo básico, sem detecção de curto-circuito, non-explosion-proof
EMT6(230V)	66400	Solteiro	230V e	Single circuit, fixed 230V power supply
EMT6-DB	66167	Dual	24~240V CA/CC	Dual circuit, sem detecção de curto-circuito, non-explosion-proof
EMT6-DB(230V)	66401	Dual	230V e	Dual circuit, fixed 230V power supply
EMT6-DBK	66168	Dual	24~240V CA/CC	Dual circuit with sensor short-circuit detection, sem ATEX
EMT6-K	269470	Solteiro	24~240V CA/CC	Single circuit, Certificado ATEX, com detecção de curto-circuito
EMT6-KDB	269471	Dual	24~240V CA/CC	Dual circuit + ATEX + detecção de curto-circuito (modelo de destino)
EMT62	171889	Solteiro	24~240V CA/CC	Single circuit, dual NO output contacts
EMT62-DB	171890	Dual	24~240V CA/CC	Dual circuit, dual NO output contacts

Guia de seleção rápida

Área perigosa de explosão (Ex-e motor) → EMT6-K / EMT6-KDB
Indústria geral, require sensor cable short-circuit detection → EMT6-DBK
Indústria geral, 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) Dimensões Físicas

montado em trilho DIN; housing dimensions identical across all EMT6 variants

Largura(C): 22.5 milímetros (nominal 23mm, standard 22.5mm DIN rail module width)

Altura(H): 83 milímetros

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

✅ Weight: 0.13 kg approx.

Observações: