Relais de surcharge thermique
Compare VIOX thermal overload relay series for motor overload protection and coordinated contactor starters. Confirm adjustment range, trip characteristics and contactor compatibility by model.
Protection contre les surcharges moteurResponds to sustained overload
Current adjustmentMatch the motor nameplate
Starter coordinationPair with contactor and SCPD
Reset and signalingConfirm model functions
Qu'est-ce qu'un relais de surcharge thermique ?
A thermal overload relay monitors motor current and operates its control contacts when a sustained overload condition exceeds its time-current characteristics. It is commonly coordinated with a contactor in a motor starter.
An overload relay does not normally provide short-circuit interruption. Its adjustment range, trip behavior, phase sensitivity, reset mode, auxiliary contacts, contactor compatibility and upstream short-circuit protection must be selected together.
Overload Relay Series Overview
Comparer les modèles VIOX publiés en utilisant les faits déjà disponibles dans les données produit.
VIOX JR28
Relais de surcharge thermiqueExaminer les données du modèle
VIOX JR36
Relais de surcharge thermiqueExaminer les données du modèle
VIOX LR2-D13
Relais de surcharge thermiqueExaminer les données du modèleVIOX LR2-D23
Relais de surcharge thermiqueExaminer les données du modèle
VIOX LR2-D33
Relais de surcharge thermiqueExaminer les données du modèle
New Type Thermal Relay LRD-13
Relais de surcharge thermiqueExaminer les données du modèleHow to choose an overload relay
Begin with the motor nameplate current and starter combination, then verify trip and reset requirements.
Plage de réglage
Select a range that includes the motor rated current and follow the setting instructions.
Caractéristiques du voyage
Match starting time, duty and applicable motor-protection requirements.
Compatibilité du contacteur
Confirm mechanical mounting, current path and accessory compatibility.
Reset and auxiliary functions
Define manual or automatic reset, test, stop and signaling needs.
Coordinate three protection roles
A complete starter coordinates switching, overload response and short-circuit protection.
Compare published Overload Relay series
Les cellules vides signifient que la valeur n'est pas disponible dans le résumé actuel du produit. Ouvrez la page du modèle ou demandez sa fiche technique avant toute spécification.
| Série | Plage de réglage | Classe de déclenchement | Remise à zéro | Contactor series |
|---|---|---|---|---|
| VIOX JR28 | — | — | — | — |
| VIOX JR36 | — | — | — | — |
| VIOX LR2-D13 | — | — | — | — |
| VIOX LR2-D23 | — | — | — | — |
| VIOX LR2-D33 | — | — | — | — |
| New Type Thermal Relay LRD-13 | — | — | — | — |
Overload Relay Applications
Environnements typiques où les caractéristiques exactes du produit doivent être vérifiées.
Overload Relay Selection Questions
Réponses rapides pour une comparaison préliminaire des gammes de produits avant la vérification détaillée des circuits.
What does a thermal overload relay protect against?
It responds to sustained motor overload according to its characteristics and operates the starter control circuit. Exact protection functions vary by model.
Does an overload relay provide short-circuit protection?
Normally no. A coordinated fuse, circuit breaker or motor protective device is required for short-circuit protection.
How is the adjustment range selected?
Choose a relay range that includes the motor nameplate current, then set and commission it according to the motor, starter and product instructions.
What is trip class?
Trip class describes the relay operating-time characteristic under specified overload conditions. The required class depends on the motor starting and protection needs.
Must the relay match the contactor?
Yes. Verify electrical rating, direct-mount or separate-mount compatibility, terminal arrangement and accessory coordination.
Need the Right Overload Relay?
Let’s Coordinate the Motor Starter.
Send the motor nameplate current, starting duty, contactor series, reset requirements, quantity and target market. VIOX will help narrow the relevant published series.
Request Overload Relay Support