Choosing between a control relay and a reversing motor starter in the relays contactors industrial switches category depends on the job, not just the price. If you need multiple isolated contacts for control logic, the Square D 8501 X080 delivers them in a single panel-mounted relay. If you need forward/reverse motor operation, the AB 100-C09\*10 combines a reversing contactor for that duty. Both components use 120V-class coils, but they solve different wiring problems.
Quick verdict
For control circuits where contact density matters, the Square D 8501 X080 is the more affordable pick at $27.99. For motor reversal, the AB 100-C09\*10 is the more complete unit at $74.99. The right choice depends on whether your panel needs many isolated control paths or a ready-to-wire reversing starter.
At a glance
| Spec | Square D 8501 X080 | AB 100-C09\*10 |
|---|---|---|
| Listed price | $27.99 | $74.99 |
| Component type | 8 NC control relay, 10A total, 120/110V coil | Reversing starter contactor with 1.6/5A overload relay, 120V coil |
| Construction | Panel-mounted, NEMA A600/P600 | Includes overload relay and connector wire between contactors |
| Condition | Used | Used |
Where each product wins
Square D 8501 X080 wins for multi-contact control. The relay packs a high number of isolated contacts into one component, and the panel-mount design fits typical control enclosures. It is a straightforward choice when your circuit logic depends on many separate contact paths rather than motor power switching.
**AB 100-C09\*10 wins for motor reversal.** Instead of assembling a reversing contactor and its associated wiring yourself, this starter package includes the connector wire between the contactors. It is a more complete reversing solution.
Square D 8501 X080 Industrial Control Relay
This heavy-duty NEMA relay comes from the Class 8501 family and is rated for 600V AC maximum. It is a used unit, so minor cosmetic wear from prior handling is possible. Its eight normally closed contacts make it a strong fit for control schemes that need multiple isolated NC paths, and the 10A continuous thermal rating gives you a clear current ceiling. Choose it when you want one relay to carry many NC signals. The limitation is that it is a control relay, not a motor starter: it cannot reverse a motor or provide overload protection by itself. If your application centers on motor reversal rather than logic contacts, this relay doesn't cover that need.
AB 100-C09\*10 Reversing Motor Starter Contactor
The AB 100-C09\*10 is a reversing motor starter contactor paired with a 1.6/5A overload relay. The package includes connector wire between the two contactors, so the reversing pair arrives wired together for easier hookup. Choose it when you need forward/reverse control of a smaller motor and want overload protection in the same component. It carries model number 193-EA1EB and mpn 100-C09D10, which helps you confirm the configuration before installation. The limitation is its specialization: this is a reversing starter, not a general-purpose relay. If you only need many isolated contacts for control logic, you'll be paying for reversing capability you won't use, and the overload range is aimed at a narrower motor current window.
Final choice by use case
Choose the Square D 8501 X080 when your panel needs a high-contact-count relay for control logic.
Choose the AB 100-C09\*10 when you need a reversing motor starter.
