What is BS EN IEC 60947‑7‑4‒PCB terminal blocks about?
BS EN IEC 60947‑7‑4 is the fourth part of the multi-series standard that specifies requirements for PCB terminal blocks primarily intended for industrial or similar use.
BS EN IEC 60947‑7‑4 applies to PCB terminal blocks intended to connect copper conductors, with or without special preparation, having a cross-section between 0.08-millimeter square and 300-millimeter square (AWG 28-600 kcmil), intended to be used in circuits of a rated voltage not exceeding 1000 V AC up to 1000 Hz or 1500 V DC.
Who is BS EN IEC 60947‑7‑4 ‒PCB terminal blocks for?
BS EN IEC 60947‑7‑4 on PCB terminal blocks is for:
- PCB manufacturers
- PCB designers
- PCB dealers and suppliers
- Connectors manufacturers
- Electronics equipment manufactures
Why should you use BS EN IEC 60947‑7‑4‒PCB terminal blocks?
Adhering to BS EN IEC 60947‑7‑4 manufacturers of PCB terminal blocks can assure increased safety by isolating and protecting other components in the electrical circuits.
BS EN IEC 60947‑7‑4 on PCB terminal blocks provides useful guidance on requirements and product designing information for PCB terminal blocks deliberated to connect with copper conductors which helps PCB manufacturers enhance the quality of their products. In addition to the product information, BS EN IEC 60947‑7‑4 on PCB terminal blocks covers items, subject to agreement between manufacturer and user.
Also, BS EN IEC 60947‑7‑4 provides specifications of connectors which is a bonus benefit to its users, as the requirements for PCB blocks and connectors are quite similar attributing to equivalent applications.
What’s changed since the last update?
BS EN IEC 60947‑7‑4:2019 supersedes BS EN 60947‑7‑4:2013, which is withdrawn. BS EN IEC 60947‑7‑4:2019 includes the following significant technical changes:
- Additional test for PCB terminal blocks with clamping units
- Tightening torques for screws given in Table 4; tightening torques added for an additional type of screw
- New criteria for verification of contact resistance introduced
- Clarification in the description of the temperature-rise test (current-temperature derating), corrections in the test sequence according to Figure 4