NovoSphere Nema 34 Closed Stepper Kit vs NovoSphere Nema 34 Closed Loop Stepper Kit

Both are NovoSphere Nema 34 closed-loop kits with the same 8.5 N·m holding torque, 1.8° step angle, two phases and the same CLE34 driver, so motion accuracy and driver behavior are effectively identical. The real split is the motor: A runs 4.9 A per phase with no brake, B runs 6.0 A per phase and adds a brake. Buy B if the load must hold position when power drops or you need more low-speed torque headroom; buy A if you have a plain horizontal axis, a smaller supply, and no need for holding force at power-off. Owners of closed-loop Nema 34 setups generally report the encoder loop removes lost steps and stalls, and the brake is the only feature that changes what the machine can safely do.

• Choose the Nema 34 4.9A kit if your axis is horizontal, needs no holding force when powered down, and you want the simpler motor with lower current draw.
• Choose the Nema 34 6.0A brake kit if the load can back-drive or drop when power is cut, such as a Z axis, lift or vertical slide.