SIEMENS
SIEMENS 22BUB32AF NEMA Magnetic Motor Starter Reversing 1NO 120V AC 3 Pole
Reversing NEMA motor starter with electronic overload adjustable from 0.75 A to 3.4 A, 120 V AC coil and 1 NO auxiliary contact
- Reversing starter enables forward and reverse motor control
- Electronic overload protection adjustable from 0.75 A to 3.4 A
- Selectable trip class 5, 10, 20 or 30 matches application needs
- Three-pole design rated 600 V AC for industrial power circuits
- 120 V AC coil voltage suits standard control panels
SIEMENS NEMA Reversing Motor Starter
The SIEMENS 22BUB32AF is a NEMA-rated magnetic motor starter designed for three-phase reversing applications. It operates on a 110/120V AC coil voltage and supports a maximum voltage rating of 600V AC. The unit provides electronic overload protection with adjustable current settings from 0.75 A to 3.4 A. It is suited for industrial machinery requiring forward and reverse motor control.
Surface-mount installation with three-pole wiring
The starter features a surface mounting style for direct panel attachment. Wiring connects to three main poles plus one normally open auxiliary contact for control circuits. Installers must verify coil voltage matches the control supply and set the electronic overload dial within the 0.75 A to 3.4 A range. Incorrect trip class selection or loose auxiliary wiring are common issues that affect protection timing and signalling.
Sustained operation with selectable trip classes
Under continuous load the electronic overload relay monitors current and trips according to the chosen class 5, 10, 20 or 30 setting. This allows matching the thermal response to motor acceleration time and duty cycle. The 3.4 A maximum setting protects motors up to 2 hp at 600V AC three-phase. Consistent performance relies on correct trip class selection and proper ventilation around the enclosed starter.
Highlights
- Reversing starter enables forward and reverse motor control
- Electronic overload protection adjustable from 0.75 A to 3.4 A
- Selectable trip class 5, 10, 20 or 30 matches application needs
- Three-pole design rated 600 V AC for industrial power circuits
- 120 V AC coil voltage suits standard control panels
Specifications
| Brand | SIEMENS |
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Questions about this item
How do I verify the starter is working after installation?
Confirm the coil energises at 110/120V AC, the three poles close cleanly, the reversing contactor interlocks without chatter, and the electronic overload holds between 0.75 A and 3.4 A at the selected trip class of 5, 10, 20 or 30.
What ships in the box and what must I source separately?
The starter includes the reversing contactor assembly with 1NO auxiliary contact, electronic overload relay and surface-mount hardware; you must supply 120V AC control wiring, motor leads rated for 600V AC and any required disconnect or short-circuit protection.
Which overload setting should I select for a 2 hp three-phase motor at 600V AC?
Set the electronic overload within the 0.75 A to 3.4 A range to match the motor’s full-load current, then choose trip class 10 for standard acceleration or class 20/30 for high-inertia loads.
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