Contents
What is DIN terminal block?
DIN rail and channel terminal blocks are rack or box mount connection points for securing two or more wires to a circuit or power bus. Certain types may include a single or dual disconnect fuse or switch feature, feed-through capability, grounding, built-in indicators and resistors, isolation and circuit protection.
Where is terminal block used?
Factories use terminal blocks to secure and/or terminate wires. In their most basic form, terminal blocks consist of several individual terminals which are arranged in a long strip. The terminal block is most useful for connecting wiring to ground.
What is the point of a terminal block?
Terminal blocks increase safety by grounding, isolating, and protecting the other components in the electrical circuit. Terminal blocks are available with finger-safe connections to prevent electrical shock. And, terminal blocks can also provide test points, which add even more safety to the circuit.
What is the purpose of DIN rail?
A DIN rail is a metal rail of a standard type widely used for mounting circuit breakers and industrial control equipment inside equipment racks. These products are typically made from cold rolled carbon steel sheet with a zinc-plated or chromated bright surface finish.
What should be the current rating of a terminal block?
For example, if an expected current of 2 A is to be drawn from a block, then a terminal block with a current rating of 3 A would be sufficient. Just like current draw, voltage also needs to be taken into account.
What is the pitch of a terminal block?
Terminal blocks usually offer pole counts from a single-pole up to as many as 24 poles. Pitch: Defined as the center distance from pole to pole, the pitch is represented in values such as 2.54 mm, 3.81 mm, 5.0 mm, and so on.
How big of a wire can a terminal block accept?
Common industry pitches would be, but are not limited to, 2.54 mm, 3.81 mm, 5.0 mm, and 7.62 mm. The minimum and maximum wire size that the terminal block can accept would be a function of the voltage/current rating.
Why are UL and IEC ratings different for terminal blocks?
Both UL and IEC ratings can appear on a datasheet with differing values. This is because each agency uses a different standard and requirements that a terminal block must meet. When selecting a terminal block, you will want to know your overall system safety requirements, and make sure the terminal block ratings comply with them.