Since the torque reel / retractor is a cylindrical drum, the tension increases as the wire is pulled out.
The pullable length of the wire varies depending on the tension setting and suspension load (see catalog).
The case is durable with an aluminum body.
With a fall prevention device (model S type only), it has excellent safety.
You can switch the ratchet ON-OFF.
The alternative model of ER-3A / B is ERM-2, and the alternative model of ER-5A / 5B is ERM-4.