RH4B-U IDEC General Relay

Review IDEC Ac24v General Purpose Relay

The IDECO Rh4B-U AC24V and Rh4B-U-AC24V General Relays are versatile and reliable electrical components designed for various automation applications. These relays are available in two versions: Rh4B-U, a normally open (NO) type, and Rh4B-U-AC24V, a normally closed (NC) type. Both versions share similar specifications, making this description applicable to both.

The IDECO Rh4B-U and Rh4B-U-AC24V General Relays are compact, measuring only 32mm x 22mm x 13mm (1.26 inches x 0.87 inches x 0.51 inches) in dimensions. This small form factor makes them suitable for space-constrained installations. The relays operate with a coil voltage range of AC24V and have a contact rating of 10A at 250VAC and 30VDC.

These general relays offer excellent electromechanical performance. They are rated for 25,000 contact operations with a contact bounce time of less than 1ms. This quick response ensures precise relay operation, reducing the risk of contact chatter and erroneous signal transmission.

The Rh4B-U and Rh4B-U-AC24V General Relays feature a robust mechanical design that ensures longevity and reliability. They have a sealing degree of IP20, meaning they are protected against dripping water from a vertical angle. This makes them suitable for use in environments where they may be exposed to some moisture.

IDECO's Rh4B-U and Rh4B-U-AC24V General Relays are easy to install and integrate into various automation systems. They have a screw terminal configuration, which simplifies wiring and allows for quick connection and disconnection. Additionally, they have a built-in test function, which enables users to check the relay's functionality without removing it from the control panel.

In conclusion, the IDECO Rh4B-U AC24V and Rh4B-U-AC24V General Relays are compact, reliable, and versatile electrical components suitable for various automation applications. They offer fast response times, robust mechanical design, and easy installation, making them an excellent choice for users seeking efficient and dependable relay solutions.

The IDEC Rh4B-U AC24V and Rh4B-U-AC24V general relays are commonly used in industrial automation applications. Both relays have some similarities and differences that are essential to consider before making a purchase.

1. Both relays are AC24V type, meaning they operate on a 24V AC power supply.

2. They have the same form factor, which is the IDEC Rh type, making them interchangeable in applications where the physical size of the relay is a concern.

3. They offer high contact ratings, making them suitable for heavy-duty applications.

1. The Rh4B-U is a normally open (NO) relay, while the Rh4B-U-AC24V is a changeover (CO) relay. This difference in contact configuration affects the application's electrical design.

2. The Rh4B-U-AC24V has an integrated overload relay, which can protect the contact from overloading and potentially extending the contact life.

3. The Rh4B-U-AC24V has a slightly higher price tag than the Rh4B-U.

1. It is a cost-effective solution for applications where a normally open contact configuration is required.

2. Its compact size makes it suitable for installations with limited space.

3. It can be used in applications where the contact life is not a concern.

1. It does not have an integrated overload relay, which may require additional components to protect the contact from overloading.

2. It does not offer the flexibility of a changeover contact configuration.

1. It offers the benefits of a changeover contact configuration, which can save wiring and reduce installation time.

2. Its integrated overload relay can protect the contact from overloading and potentially extend its life.

3. It is suitable for applications where a changeover contact configuration and contact protection are essential.

1. It has a slightly higher price tag than the Rh4B-U due to its additional features.

2. Its larger size may make it less suitable for installations with limited space.

In conclusion, the choice between the IDEC Rh4B-U AC24V and Rh4B-U-AC24V relays depends on the specific application requirements. If a normally open contact configuration and cost-effectiveness are the primary concerns, then the Rh4B-U is a suitable option. However, if a changeover contact configuration, integrated overload relay, and contact protection are essential, then the Rh4B-U-AC24V is the recommended choice.

Details:

Ul recognized e66043/e55996. Four contact arrangements. Common options include check button and indicator light. Flange mount available.

Plug in styles can be mounted using either panel mount or din rail sockets. The rh series relays are widely used in instrumentation and industrial equipment. Ac and dc coils. 187 quick connect terminals.

Plug in or PC mount. Relays, rh series item # RH4B-U-ac24 relay, 4pdt, 10a, 24vac coil information. 10 contacts. Their compact midget size saves space.

specifications genpurrelays:

• brand: Idec
• mpn: Rh4b-u
• mounting style: Din Rail
• current rating: 1-15 A
• smart home compatibility: Universal
• suitable for: Interior
• current type: Ac
• type: Power Relay
• unit type: Unit
• contact configuration: 4 Pole Double Throw
• number of pins: 14-pin

seller genpurrelays:

• rating: 100.0%
• # reviews: 11
• city: anchorage, alaska

offer genpurrelays:

• availability: in stock
• options: ship-to-home
• prices: $39.99–$100.16
• item condition:
  • Used
  • New – Open box
  • New
• in stock #: 5
• best offers: true
• started: may 18, 2026
• sold #: 12

payments genpurrelays:

• wallet: google-pay
• other
• credit card: diners-club

returns genpurrelays:

• policy: no returns

shipping genpurrelays:

• transit: 5-10 days
• class: standard
• service: usps ground advantage
• carrier: usps
• type: fixed

general genpurrelays:

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