3G-OTH-38138 Relay, 4 P 24V: The Complete International Buyer's Guide
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The 3G-OTH-38138 Relay, 4 P 24V is a four-pole electromechanical relay designed for 24 VDC coil control in industrial panels. It allows one control signal to switch up to four independent circuits, making it a compact solution for interlocking, signal isolation, and load switching in machinery and process control systems.
What is a 3G-OTH-38138 Relay, 4 P 24V?
A 3G-OTH-38138 Relay, 4 P 24V is a plug-in or PCB-mount industrial relay with four changeover or normally open contacts and a 24 VDC coil. It is part of the broader family of 4-pole control relays used across automation, HVAC, and material handling equipment.
Relays in this class are commonly associated with brands such as Schneider Electric, ABB, and Siemens, which set the dimensional and electrical conventions many relays follow. Always confirm the specific manufacturer's datasheet for contact material, expected electrical life, and coil suppression requirements.
How does a 4-pole 24 VDC relay work?
When 24 VDC is applied to the coil, an electromagnet pulls the armature, closing (or opening) the contacts. The four poles operate simultaneously, so a single control signal can switch multiple loads or provide redundant paths.
Typical applications include motor starter interlocking, PLC output expansion, and switching of indicator lamps or small solenoids. Because the coil is 24 VDC, the relay is well suited to control systems that use 24 VDC logic, which is common in International markets where 24 VDC control buses are standard.
Quotable definition
A 3G-OTH-38138 Relay, 4 P 24V is a four-pole industrial control relay with a 24 VDC coil, used to switch multiple electrical circuits from a single control signal in automation and process control panels.
Spec table: 3G-OTH-38138 Relay, 4 P 24V
| Parameter | Typical value | Notes |
|---|---|---|
| Coil voltage | 24 VDC | Nominal; check tolerance ±10% |
| Number of poles | 4 P | 4 changeover or 4 NO contacts |
| Contact rating | 5–10 A per pole | Depends on load type (AC-1, AC-15) |
| Coil power | 0.5–1.5 W | DC coil; verify with datasheet |
| Operating temperature | -40 °C to +70 °C | Typical industrial range |
| Mounting | DIN rail or plug-in socket | Confirm socket type |
| Electrical life | 100,000 operations | At rated load; mechanical life higher |
Note: Values are typical for this relay class. Always confirm with the specific manufacturer's datasheet before ordering.
Types and applications in International markets
Four-pole 24 VDC relays are used across industries in International, from packaging lines in Germany to water treatment plants in Southeast Asia. Common variants include plug-in relays with DIN rail sockets, PCB-mount relays for embedded control, and sealed relays for harsh environments.
In 50 Hz markets, AC coil versions are common, but 24 VDC coils are frequency-independent and therefore preferred where control power is derived from 24 VDC power supplies. In 60 Hz markets such as North America, 24 VDC control is also widespread, making the 3G-OTH-38138 Relay, 4 P 24V a versatile choice.
Selection criteria: how to choose a 3G-OTH-38138 Relay, 4 P 24V
- Coil voltage: Confirm 24 VDC nominal and check the allowable voltage range (typically 20.4–26.4 VDC).
- Contact configuration: Decide between 4 changeover (4 CO) or 4 normally open (4 NO) based on your switching logic.
- Contact rating: Match the relay's current rating to your load. For inductive loads, derate by 50% or use a suppression diode.
- Duty cycle: For high-frequency switching, choose a relay with a higher electrical life or consider a solid-state relay.
- Environment: In dusty or humid sites, specify sealed relays or enclosures with appropriate IP rating.
- Mounting and socket: Ensure compatibility with your panel's DIN rail or PCB footprint.
Product selection ladder
While the 3G-OTH-38138 Relay, 4 P 24V is a specific relay, 3G Electric supplies a broad range of industrial components. The table below shows a representative product from our catalogue that may be used alongside relays in control panels.
| Product | Type | Key specification | Typical use |
|---|---|---|---|
| RPB L4 Light Assembly | Lighting component | For abrasive blasting helmets; 24 VDC compatible | Illumination in low-light industrial environments |
When specifying relays for a complete panel, consider stepping up to higher-specification relays if your application involves high inrush currents or safety-critical circuits. For lighting and visibility in harsh environments, the RPB L4 Light Assembly is a complementary component.
Why source from 3G Electric?
3G Electric has over 35 years of experience interpreting industrial requirements and supplying genuine parts across 14 departments. We offer the 3G-OTH-38138 Relay, 4 P 24V and related components with quotes for parts beyond our catalogue. Goods are offered EXW Singapore, and we support international buyers with documentation and technical specifications.
Our specialist depth in combustion, pumps, and controls means we understand the operational context of your relay application. We are curated and accountable—we get the right answer, not infinite warehouse stock.
FAQ
What is the difference between 4 P and 4 CO on a 3G-OTH-38138 relay?
4 P means four poles; 4 CO means four changeover contacts (each pole has common, normally open, and normally closed terminals). 4 NO means four normally open contacts. Confirm the contact arrangement in the datasheet.
Can I use a 24 VDC relay in a 230 VAC control circuit?
No, the coil voltage must match the control circuit. A 24 VDC coil requires a 24 VDC supply. For 230 VAC control, use a relay with a 230 VAC coil or add a 24 VDC power supply.
How do I select a relay for high-cycle applications in International?
Check the electrical life rating (operations at rated load). For high-cycle applications, consider relays with higher life ratings or solid-state relays. Also ensure the coil suppression is adequate to prevent back-EMF.
Where can I buy a 3G-OTH-38138 Relay, 4 P 24V in International?
3G Electric supplies the 3G-OTH-38138 Relay, 4 P 24V and related components to international buyers. Contact us for a quote; goods are offered EXW Singapore.
What is the typical lead time for a 3G-OTH-38138 Relay, 4 P 24V?
Lead time depends on the specific manufacturer and quantity. Contact 3G Electric for current lead times and availability.
Are 24 VDC relays compatible with both 50 Hz and 60 Hz power systems?
Yes, 24 VDC coils are frequency-independent. However, if the relay is used to switch AC loads, the contact rating may differ for 50 Hz and 60 Hz; check the datasheet.
Key takeaways
- The 3G-OTH-38138 Relay, 4 P 24V is a four-pole, 24 VDC coil relay for industrial control panels.
- Verify coil voltage, contact configuration, and contact rating against your application.
- 24 VDC coils are compatible with both 50 Hz and 60 Hz systems.
- 3G Electric supplies this relay and related components with EXW Singapore terms.
- Always consult the manufacturer's datasheet for exact specifications.
Contact 3G Electric for a quote on the 3G-OTH-38138 Relay, 4 P 24V or to discuss your control panel requirements. We provide documentation and technical specifications to help you specify the right component.
