Overcurrent-Undervoltage relay?

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Discussion Overview

The discussion revolves around the existence and functionality of relays that can operate as both overcurrent and undervoltage protection devices. Participants explore the characteristics and applications of such relays, as well as the distinctions between overcurrent and undervoltage conditions.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant inquires about the existence of a relay that can function for both overcurrent and undervoltage protection.
  • Another participant suggests using MPCB for lower current ratings to protect motors, indicating a specific application context.
  • A participant clarifies that overcurrent and undervoltage are distinct conditions, explaining how each condition is detected and how relays may be activated in response.
  • A later reply mentions that there are microprocessor-based relays available that can perform multiple protection functions, implying a potential solution to the initial inquiry.

Areas of Agreement / Disagreement

Participants express differing views on the functionality of relays, with some suggesting that separate relays are typically used for overcurrent and undervoltage, while others propose the existence of multifunctional relays. The discussion remains unresolved regarding the specific capabilities of such relays.

Contextual Notes

There may be limitations in the discussion regarding the definitions of overcurrent and undervoltage, as well as the specific capabilities of the relays mentioned. The applicability of microprocessor-based relays is not fully explored.

kuraido
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Is there such a relay that can act as overcurrent as well as undervoltage? I might have mistaken it for something else so I just want to make sure. Thanks in advance.
 
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What is the maximum current rating...?

Try MPCB for lower current ratings to protect motors.
 
Overcurrent and undervoltage are two separate condititions.

For example: A sensing circuit is used to detect voltage. When the voltage decreases below a set point an alarm or signal is generated. This signal may activate a relay to control something else.

Same for overcurrent: A circuit detects the current. When the current exceeds some set point, an alarm or signal is generated. This signal may activate a relay to control something else.
 
kuraido said:
Is there such a relay that can act as overcurrent as well as undervoltage? I might have mistaken it for something else so I just want to make sure. Thanks in advance.
There are companies that provide microprocessor based "relays" which preforms a large number of protection functions in one "relay" case. e.g.

"www.ceerelays.co.uk/brochures/CEE%20PRAG.pdf"
 
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