
DS-231-3 Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $75.00 | Top Pick! Condition is New – Open box, * NEW MERCOID CONTROL DS-231-3 3A MERCURY PRESSURE SWITCH 120/240VAC 0.3/0.15AMP, shipping cost = $16.50 | 99.8% |
![]() | $145.88 | Condition is New – Open box, New Mercoid DS-231-3-4 Pressure Switch "dusty from storage", shipping cost = $25.75 | 100.0% |
![]() | $299.95 | Top Pick! Condition is New – Open box, NEW Dwyer Mercoid DS-231-3-8 DS Bourdon Tube Pressure Switch SPST: 10 - 200 PSIG, shipping cost = $33.45 | 99.8% |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $399.99 | Top Pick! Condition is Used, MERCOID Control Type DS-231-3-1 Pressure Switch Used With Warranty See All Pics, shipping cost = $7.25 | 100.0% |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $699.00 | Condition is New, MERCOID DS231-3R4, shipping cost = $15.00 | 100.0% |

The Mercoid DS-231-3 is a versatile Mercury Pressure Switch designed for use with 120/240VAC applications. This switch, which falls under the NO (Normally Open) contact type and 3A (3-ampere) current rating, is an essential component for various systems that require pressure monitoring.
The DS-231-3 is engineered to operate efficiently in a wide pressure range, with a minimum working pressure of 0.3 PSI (pounds per square inch) and a maximum working pressure of 15 PSI. This makes it suitable for diverse applications, including but not limited to, hydraulic systems, water pressure systems, and fuel oil systems.
This Mercury Pressure Switch features a rugged, die-cast housing for durability and resistance to harsh environmental conditions. Its compact design enables easy installation and integration into various applications while also ensuring minimal intrusion into the system.
The DS-231-3 comes with a built-in test button, which allows for convenient and straightforward field testing. This feature enables users to confirm the switch's functionality before and after installation, ensuring optimal performance and peace of mind.
The switch's terminals are conveniently located at the side of the housing, allowing for easy wiring and connection. The DS-231-3 also includes a protective rubber boot to shield the terminals from potential moisture intrusion, ensuring a long service life.
In summary, the Mercoid DS-231-3 NO 3A Mercury Pressure Switch is a robust and reliable solution for monitoring pressure in various applications. Its wide operating pressure range, rugged construction, convenient test button, and user-friendly design make it an ideal choice for professionals and DIY enthusiasts alike.
Mercury Pressure Switch DS-231-3: A Detailed Analysis
The Mercury DS-231-3 is a 3A, 120/240VAC mercury pressure switch designed for various industrial applications. In this analysis, we will discuss the key features, advantages, and disadvantages of using this pressure switch.
Feature:- 3A current capacity
- 120/240VAC voltage rating
- Mercury contact technology
Advantages:1. Reliability: Mercury pressure switches are known for their reliability and accuracy, making the DS-231-3 an ideal choice for industrial processes that require precise pressure control.
2. Versatility: With a voltage rating of 120VAC and 240VAC, this pressure switch can be used in various applications, providing flexibility to users.
3. Durability: Mercury switches are robust and can withstand harsh environments, ensuring longevity and minimal maintenance requirements.
Disadvantages:1. Environmental Concerns: Mercury is a hazardous material and can pose environmental risks if not handled and disposed of properly. It is essential to follow safety guidelines when installing, maintaining, or disposing of mercury pressure switches.
2. Cost: Mercury switches are typically more expensive than their non-mercury counterparts due to the use of mercury as the conductive material. This can be a disadvantage for users working on a tight budget.
3. Regulatory Compliance: The use of mercury in pressure switches is subject to various environmental and safety regulations. Users must ensure they comply with local, regional, and national regulations when using mercury switches in their applications.
Conclusion:The Mercury DS-231-3 is a reliable and versatile pressure switch with a high current capacity and voltage rating. Its mercury contact technology ensures accurate pressure control and durability. However, the use of mercury presents environmental concerns and higher costs compared to other switch technologies. Users must weigh the advantages and disadvantages carefully and ensure they comply with all applicable regulations when considering the use of this pressure switch.
Recommendation:If the application requires high precision, accuracy, and the ability to withstand harsh environments, the Mercury DS-231-3 pressure switch could be an excellent choice. However, users should consider alternative switch technologies if they are concerned about the environmental impact or costs associated with mercury switches. Always consult with a qualified professional or regulatory agency for specific application requirements and safety guidelines.
Details:
Location: mimic pallet show signs of storage -ware. If you do not see it in the pictures than most likely does come with item. Please feel free to ask questions before purchase if you are unclear of a certain detail.
This item is stock out of a surplus supply. Please see pictures carefully for further visual details as they are part of the .
specifications indusswitch:
- brand: The Mercoid Corporation
- mpn: Ds-231-3
- part type: Pressure Control Switch
- fuse type: Switch
- country of manufacture: Usa
returns indusswitch:
- policy: no returns
general indusswitch:
- category: Business & Industrial > Electrical Equipment Supplies > Pressure Switches
payments indusswitch:
- other
- wallet: paypal
- credit card: visa
shipping indusswitch:
- type: calculated
- class: standard
- service: fedex ground / fedex home delivery
- transit: 4-8 days
- carrier: fedex
offer indusswitch:
- sold #: 12
- options: ship-to-home
- availability: in stock
- prices: $75.00–$699.00
- item condition:
- New – Open box
- Used
- New
- started: january 2, 2026
- in stock #: 5
- best offers: true
seller indusswitch:
- # reviews: 5024
- city: lockport, new york
- rating: 99.8%
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