Introduction to the features of terminal block 139

139 terminal block Designed to facilitate wire connections, these devices are essentially metal strips sealed within insulating plastic. Each end features holes for inserting wires and screws for tightening or loosening the connections—for instance, when two wires need to be connected or disconnected at times, these terminals allow for quick and easy connection and disconnection without the need for soldering or wrapping the wires together, making the process highly convenient and rapid. Moreover, they are well-suited for interconnecting large numbers of wires. In the electrical industry, there are specialized terminal strips and terminal boxes, all equipped with wiring terminals—single-layer, double-layer, current-rated, voltage-rated, standard, disconnectable, and more. A certain crimping area is essential to ensure reliable contact and to guarantee that sufficient current can flow through the terminals.

139 terminal block What are its characteristics? Let’s all take a brief look at them together below.

139 terminal block

By leveraging the existing rail-mounted terminal block screw-connection technology and incorporating a circuit composed of electronic components, we have achieved optoelectronic signal transmission and coupling. At the heart of the automatic control system for terminal blocks is the control unit, which must be reliably isolated from all sensors and actuators to prevent interference. This unit performs this function effectively, ensuring that on-site signals are compatible with the low voltages required by the electronic control devices. Additionally, it serves as an interface component between peripheral devices used for process control and the control, signaling, and regulating equipment, and is suitable for various voltage and power ranges.

139 terminal block It boasts advantages such as low signal loss, high switching frequency, no mechanical contact bounce, wear-free switching, high insulation voltage, no vibration, no positional sensitivity, and long service life; therefore, it has found widespread application in the field of automatic control.

What are the precautions for terminal block 139? Let’s take a brief look at them together below.

1. When tightening the wiring connections, apply moderate force to avoid stripping the threads of the bolts and nuts due to excessive force. If you find that a bolt or nut has already been stripped, promptly replace it—never attempt to continue working with a damaged component.

2. When tightening or loosening screws with a screwdriver, apply firm pressure while turning the screwdriver to ensure the screw is securely tightened or loosened. This prevents the screw and screwdriver from slipping, which could damage the screw and make it difficult to remove—especially when dealing with commonly used air vents inside a hanging cabinet.

3. If you encounter bolted connections with nuts that are difficult to remove, don't act rashly—this could lead to severe deformation and make disassembly even more challenging. Instead, gently tap the nuts or apply a loosening agent to the screws before proceeding with the disassembly of the product.

4. Do not use pliers to tighten or loosen bolts and nuts, as this may cause damage. When using a wrench, adjust the opening appropriately to prevent bolts and nuts from being damaged, deformed, or difficult to remove.

5. The same terminal can connect two wires of the same type and specification.

6. For terminal blocks that are prone to loosening or easy contact with harmful social influences, the wire connection terminals must be designed with a “?”-type fastening mechanism to increase the contact area and prevent loosening.

7. When wire terminals or lugs are connected to each other, it is prohibited to install non-copper gaskets or gaskets with poor conductivity in between.

8. When connecting wire terminals, the contact surfaces should be smooth and free of oxidation. Before connecting wire ends or copper bars, the contact surfaces must be cleaned and coated with conductive paste, then securely tightened.

9. When connecting temporary wires, for single-strand flexible wires, you can fold the wire end over once before connecting it to the lower terminal of the circuit breaker. For single-core rigid wires, connect them to the lower terminal of the circuit breaker in a “?” shape.

10. For wiring of motors rated 30 kW and above, it is required not to use gaskets with poor conductivity, such as galvanized nuts, flat washers, or spring washers. Instead, a jumper wire should be installed between the motor lead wires and the cable connecting to the motor.

11. When using electrical tape to wrap cables or other equipment for insulation protection, the insulation should be compressed at a ratio of 1/2 from one end to the other, and there should be at least one full back-and-forth pass.