0TB3104-7021
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The 0TB3104-7021 terminal block supports 4 poles, has a rated current of 24 A, a rated voltage of 800 V, and operates within a temperature range of -40°C to +105°C. Part of the 0TB Terminal Blocks series by B & R Automation, it features DIN rail mounting, polyamide 6.6 material, and UL, CSA, and VDE approvals.
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Product Description:
The 0TB3104-7021 Terminal Block, manufactured by B & R Automation, is a tiny screw clamp terminal product that is used in making fine electrical connections. This terminal block’s tightening torque value is specified as 0.5 to 0.6 Nm to provide adequate clamping force without conductor or thread damage.
This terminal block’s 4-pin configuration provides connection points for multi-line circuits in small control panels. Designed for demanding electrical environments, the 0TB3104-7021 terminal block supports a nominal voltage of 600 V, thus well-suited for systems requiring higher voltage isolation and safety compliance. The reliable conductor retention during continuous operation is guaranteed by this terminal block’s screw clamp mechanism, even under mechanical stress and heat changes. This terminal block is exclusively compatible with copper conductors. It is not meant to accommodate aluminum wires, which ensures that it keeps low contact resistance and long-term stability. Alongside the voltage rating, it has a nominal current of 31 A for safe operation with higher current loads without overheating or compromising conductor integrity.
This terminal block usually supports an AWG range of 22 to 10, which meets the needs of various wire sizes in industrial automation and control wiring. In the event of having wire end sleeves with plastic covering, this terminal block supports sizes between 0.25 mm² and 6 mm² to provide a clean and secure finish for terminated wires. The pitch of the 0TB3104-7021 terminal block is 7.62 mm, permitting safe spacing of the conductor while still supporting dense mounting on DIN rails or panels. Furthermore, the contact resistance of this terminal block has a rating equal to or less than 4.5 mΩ to assist efficient current flow and reduce power loss at the point of connection.
Frequently Asked Questions about 0TB3104-7021:
Q: How does the screw clamp design improve wire retention?
A: The screw clamp provides firm pressure on the conductor, reducing chances of loosening under vibration. It also allows repeated tightening without damaging the wire.
Q: Why is a 0.5–0.6 Nm tightening torque range specified?
A: This torque ensures secure mechanical clamping without stripping threads or crushing conductors. It maintains stable electrical contact throughout operational cycles.
Q: What does the 7.62 mm terminal pitch mean in practical applications?
A: It ensures sufficient insulation spacing between terminals, reducing the risk of electrical arcing. It also allows compact mounting without compromising safety.
Q: Why does 0TB3104-7021 not support aluminum wires?
A: Aluminum wires have different thermal expansion and oxidation properties, leading to poor contact reliability. The terminal is optimized for copper to maintain low resistance.
Q: What benefit does the ≤4.5 mΩ contact resistance provide in 0TB3104-7021?
A: It ensures minimal energy loss at the connection points. This supports efficient current transfer and lowers operating temperatures.
