# Pressure switch or relay

Canonical URL: https://eloragrid.ai/protection-functions/63-pressure-switch-or-relay
Publisher: Elora Grid
Updated: 2026-10-13
Lookup label: 63
Drawing use: SLD, Schematic
Reference families: IEEE / ANSI

Provides an electrical response to a gas, liquid or other pressure condition.

## What it represents

Provides an electrical response to a gas, liquid or other pressure condition.
In a drafting package, connect this reference to the monitored vessel or compartment and sensor contact. The associated drawing should trace the pressure alarm, trip or permissive path; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings.

## How to read it

- Identify the monitored vessel or compartment and sensor contact.
- Trace the pressure alarm, trip or permissive path.

## Information to show or reference

- Label the monitored vessel or compartment and sensor contact.
- Cross-reference the pressure alarm, trip or permissive path.
- Identify the device tag, manual revision and logic drawing that define this implementation.

## Important distinction

Pressure supervision is not automatically a Buchholz gas-accumulation function; identify the sensor and the actual operating quantity.

## Facts

- ANSI / IEEE function number: 63
- Drawing context: The monitored vessel or compartment and sensor contact
- Application scope: Protection or apparatus-control role; exact implementation is defined by the equipment documentation.

## Public references

- [SecoGear medium-voltage switchgear application and technical guide, DET-882](https://library.e.abb.com/public/a06cf4cf38b34800b27bb337ab12f74f/DET-882%20SecoGear%205kV-15kV%20IEEE%20Metal%20Clad%20Switchgear_Application%20and%20installation%20guide.pdf) — ABB. Public manufacturer number/name association. Drafting explanations are independently written.
- [IEEE C37.2-2022: power-system device function numbers](https://ieeexplore.ieee.org/document/9984140) — IEEE. Normative device-number publication; exact edition wording and compliance require the licensed standard.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.