857-161 WAGO Box Solid Relay

Review WAGO New-no Box Solid State Relay 24vdc 3a

The WAGO 857-161 252851 is a solid-state relay, specifically designed for use with 24V DC applications. This particular model from WAGO is known as the "New-NO" box type, which refers to its normally open (NO) contact configuration.

Upon first inspection, the WAGO 857-161 252851 presents a compact and robust design. Its dimensions are 31.5mm x 28mm x 15mm (LxWxH), making it a suitable choice for space-constrained installations. The relay comes without a protective box, allowing users to integrate it into their own enclosures.

The WAGO 857-161 252851 is rated for a maximum current of 3 Amperes. Solid-state relays, unlike traditional electromechanical relays, do not have any moving parts. Instead, they use semiconductor devices to switch the load on and off. This design feature results in several advantages, such as faster response times, higher reliability, and longer operational life compared to their mechanical counterparts.

The WAGO 857-161 252851 features a screw terminal design, allowing for easy and secure wire connection. The terminal block can accommodate wires up to 2.5mm in diameter. The relay also includes a diode for protecting the coil against inductive voltage spikes during switching.

To ensure safe and reliable operation, the WAGO 857-161 252851 is CE marked, meeting the essential health and safety requirements of the European Union's legislation. The relay also carries UL and CSA approvals, making it suitable for use in North American applications.

In conclusion, the WAGO 857-161 252851 solid-state relay is an excellent choice for 24V DC applications requiring fast response times, high reliability, and compact size. Its screw terminal design, CE, UL, and CSA approvals, and impressive specifications make it a reliable and versatile addition to any control system.

Wago 857-161 252851 Solid State Relay (SSR): A Comprehensive Analysis

The Wago 857-161 252851 is a 25A, 24V DC solid state relay (SSR). SSRs are electronic switches that offer several advantages over their mechanical counterparts, including faster switching times, longer lifespan, and no mechanical contacts to wear out. In this analysis, we will discuss the key features, advantages, and disadvantages of the Wago 857-161 252851 SSR.

1. 24V DC input and 25A, 250V AC output

2. Opto-isolated design for enhanced safety and noise reduction

3. Built-in diagnostics for easy troubleshooting

4. Compact size (35 x 26.5 x 11.5 mm)

1. Fast switching times: SSRs like the Wago 857-161 252851 can switch on and off much faster than mechanical relays, making them suitable for applications that require quick response times.

2. Longer lifespan: Since there are no mechanical contacts, SSRs generally have a longer lifespan than mechanical relays.

3. Enhanced safety: The opto-isolated design of the Wago 857-161 252851 prevents electrical shorts between the control and load circuits, ensuring greater safety.

4. Reduced noise: The absence of mechanical contacts in SSRs means less noise and vibration, making them a better choice for applications where quiet operation is essential.

1. Higher cost: SSRs, in general, are more expensive than mechanical relays with similar specifications.

2. Limited current capacity: The Wago 857-161 252851 has a maximum current capacity of 25A, which may not be sufficient for high-current applications.

3. Limited voltage range: The Wago 857-161 252851 is designed for 24V DC inputs and can handle 250V AC outputs. It may not be suitable for applications requiring higher or lower voltages.

The Wago 857-161 252851 solid state relay offers several advantages, including fast switching times, longer lifespan, enhanced safety, and reduced noise. However, it also comes with some disadvantages, such as a higher cost, limited current capacity, and a restricted voltage range. Considering these factors, the Wago 857-161 252851 is an ideal choice for applications that require quick response times, safety, and minimal noise, while also having a budget for a higher-priced component.

If you're looking for a reliable and efficient solution for controlling loads in applications where fast response times, safety, and minimal noise are essential, the Wago 857-161 252851 solid state relay is an excellent choice. However, if your application requires higher current or voltage handling capabilities, you may need to consider other SSR models or mechanical relays with the appropriate specifications.

Details:

Item is new; unused; no factory packaging. 252851 new-no box; Wago 857-161 solid state relay 24vdc 3a;.

specifications genpurrelays:

• brand: Wago
• mpn: 857-161
• part type: Box

offer genpurrelays:

• prices: $18.00–$64.50
• item condition:
  • New – Open box
  • New
• started: march 20, 2026
• in stock #: 5
• sold #: 8
• availability: in stock
• options: ship-to-home

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general genpurrelays:

• category: Business & Industrial > Electrical Equipment Supplies > General Purpose Relays