Overview
The Allen-Bradley 505X-TOD /D with 2x 500-NX101* /D thermal overload is a NEMA Size 00 reversing motor starter designed for full-voltage 3-phase motor control. This unit combines the 505X-TOD reversing contactor with eutectic alloy thermal overload relays, providing both motor startup control and overload protection in a compact, open-frame configuration. Ideal for pump motors, fan drives, and reversible conveyor systems in industrial and commercial applications.
Key Features
- 3-Phase Reversing Control: Full-voltage reversal switching for reversible motor applications
- Eutectic Alloy Overload Relay (500-NX101*): Temperature-compensated thermal protection with Class 10 trip characteristics
- NEMA Size 00: Compact form factor suitable for space-constrained panel installations
- Rated for 9A Continuous, 600VAC Maximum: Suitable for small-to-medium industrial motors
- Control Coil Options: Available with 110V 50Hz or 120V 60Hz control voltage
- Open-Frame Design: Requires separate circuit breaker for branch protection; ideal for custom enclosures
Technical Specifications
| Specification | Value |
| Catalog Number | 505X-TOD /D (Starter) + 500-NX101* /D (Overload Relay) |
| NEMA Size | 00 |
| Phase Configuration | 3-Phase with 3-4 pole option |
| Maximum Continuous Current | 9A |
| Maximum Voltage | 600VAC |
| Control Coil Voltage | 110V 50Hz or 120V 60Hz |
| Overload Type | Eutectic Alloy (Class 10 thermal compensation) |
| Coil Torque | 12 lb-in |
| Wire Size (Maximum) | #10 AWG copper only |
| Insulation Rating | 75°C copper |
| Impulse Withstand Voltage (Uimp) | 8 kV |
| Starter Type | Full Voltage, Reversing, Without Enclosure |
| Series | D |
| Weight (Approx.) | 1.8 kg |
| Condition | Used |
Typical Applications
- Reversible motor control for centrifugal pumps and circulation systems
- Bidirectional conveyor belt and hoist control
- Fan and blower forward/reverse switching
- Machine tool spindle reversing duty
- HVAC unit reversing damper motors
- Industrial agitator and mixer direction control
Compatibility & Replacements
The 500-NX101* /D is the eutectic alloy thermal overload relay module designed as a standard replacement for Bulletin 505 reversing starters. This assembly uses the proven Rockwell Automation Bulletin 505 platform, which remains in service across legacy industrial automation systems worldwide. While newer NEMA IEC designs have emerged, the 505X-TOD series continues as a drop-in solution for retrofit and replacement applications where original control architecture must be preserved.
Separate disconnection means (circuit breaker or switch) is required for branch circuit protection, as the 505X-TOD is shipped without integral overload protection in the power circuit—relying entirely on the external thermal overload relay assembly for motor protection.
