Description
RELIANCE SR3000 2SR40700 Product Description
Product Overview
RELIANCE SR3000 2SR40700 is a regenerative unit / braking module belonging to the Reliance Electric SR3000 series. Manufacturer documentation identifies 2SR40700 specifically as the 460 VAC large regenerative unit, designed to work with compatible Reliance drive systems to manage regenerative energy generated during motor deceleration. The official REJ documentation lists the 2SR40700 under the SR3000 series large regenerative units and distinguishes it from the 230 VAC 2SR20450 version.
The RELIANCE SR3000 2SR40700 is therefore not a conventional PLC or communication module. Its principal function is associated with the drive’s regenerative/braking circuit, helping handle energy returned from the motor when a high-inertia load is rapidly decelerated. It is particularly relevant to older Reliance GV3000/SE and compatible drive installations where controlled braking and DC-bus energy management are required.
For maintenance of legacy industrial drive systems, SR3000 2SR40700 provides a practical replacement component for existing braking/regenerative architectures. Exact drive voltage, regenerative-unit configuration and associated braking hardware should be checked before substitution.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | SR3000 2SR40700 |
| Manufacturer | Reliance Electric |
| Product Series | SR3000 |
| Product Type | Large Regenerative / Braking Unit |
| Rated Voltage Class | 460 VAC |
| Application | Regenerative Energy / Dynamic Braking |
| Drive Compatibility | Compatible Reliance drive systems |
| Typical Associated Drive | GV3000/SE |
| Function | Absorb/manage regenerated motor energy |
| Installation | Industrial drive cabinet |
| Cooling | Industrial forced-air / system cooling |
| Control Architecture | SR3000 regenerative system |
| Hardware Reference | 2SR40700 |
| Related 230 V Model | 2SR20450 |
| Application Category | High-power AC Drive Braking |
The official Reliance/REJ documentation explicitly lists “SR3000 Series Large Regenerative Unit,” AC 230 V model 2SR20450 and AC 460 V model 2SR40700.
Some secondary listings describe 2SR40700 as a “Bus Snubber” for a 15 kVA/20 HP SR3000 system, while other sellers incorrectly classify it as a general bus-buffer or solid-state breaker. These descriptions conflict with the manufacturer documentation, so the regenerative/braking-unit identification is the more reliable classification.
Main Features and Advantages
Regenerative Energy Management
The main purpose of RELIANCE 2SR40700 is to manage electrical energy returned to the drive DC bus during motor deceleration. When a high-inertia motor/load combination is rapidly slowed, the motor can operate temporarily as a generator. The regenerative unit provides the appropriate path for handling this energy and helps prevent excessive DC-bus voltage.
SR3000
460 VAC Drive-System Compatibility
The 2SR40700 is specifically associated with the 460 VAC SR3000 regenerative-unit family. This differentiates it from the 2SR20450, which is the corresponding 230 VAC model. Correct voltage-class matching is essential when replacing the unit.
Improved Deceleration Performance
In heavy industrial machinery, uncontrolled regeneration can restrict how quickly a motor can be decelerated. A correctly configured regenerative/braking system allows the drive to achieve controlled deceleration without repeatedly triggering DC-bus overvoltage protection.
Protection of Drive Electronics
By providing a controlled mechanism for handling regenerated energy, the SR3000 2SR40700 helps protect the drive’s DC-link components and power electronics from excessive voltage during aggressive braking conditions.
Suitable for High-Inertia Loads
The regenerative architecture is particularly valuable for machinery where motors repeatedly accelerate and decelerate substantial rotating or moving masses. This includes conveyors, winders, unwinders, material-processing equipment and other production machinery.
Legacy-System Compatibility
The 2SR40700 remains useful for maintenance of older Reliance drive installations. The official REJ discontinued-product documentation continues to list the SR3000 2SR40700 and identifies WR-B6016 / URB7030 as associated replacement or related hardware, while noting that specifications may be partially different and require verification.
Reduced Downtime
Keeping an exact SR3000 2SR40700 spare can shorten troubleshooting and replacement time in plants where the original Reliance drive architecture is still operating. This is particularly important for production lines using discontinued drive hardware.
Application Fields
RELIANCE SR3000 2SR40700 is primarily used in industrial AC drive systems where motor deceleration generates significant regenerative energy. It is particularly useful for equipment with high inertia, frequent braking cycles or rapid speed changes.
In paper and converting machinery, regenerative/braking equipment can support winders, unwinders, rollers and other rotating sections where controlled stopping and tension management are important. Proper DC-bus energy handling helps prevent drive trips during rapid deceleration.
In metallurgical and material-processing systems, the 2SR40700 can be applied to high-inertia rollers, conveyors and production machinery that require repeated acceleration and braking. These applications can generate substantial regenerated energy that must be managed by the drive system.
The unit can also be used in industrial manufacturing, lifting-related machinery, process lines and other heavy-duty drive applications where compatible Reliance GV3000/SE or SR3000 architectures are installed. The regenerative unit works as part of the complete drive system rather than as an independent motor controller.
For replacement projects, engineers should verify the 460 VAC voltage class, associated drive model, regenerative configuration, braking requirements and interconnection hardware. The 2SR40700 should not be substituted directly with the 230 VAC 2SR20450 without confirming the complete system design.
Related Products
- 2SR20450 — SR3000 large regenerative unit for 230 VAC systems; corresponding lower-voltage model to 2SR40700.
- WR-B6016 — Related hardware identified by Reliance’s discontinued-product documentation for the SR3000 2SR40700 system.
- URB7030 — SR7000 regenerative/braking kit listed as related replacement hardware; specifications should be verified before substitution.
- GV3000/SE — Reliance Electric AC drive family commonly associated with SR3000 braking/regenerative applications.
- SR3000 Series — Reliance regenerative/braking product family to which 2SR40700 belongs.
- VZ3000 UAZ3455/3475 — Related Reliance high-power AC drive hardware for industrial motor-control applications.
- VZ7000 UVZ701E — Reliance high-performance digital AC servo-drive family for applications requiring higher dynamic response.
- S-D4006 — Reliance PSC digital I/O card used for discrete machine-control signals.
- S-D4008 — Reliance PSC analog I/O card used for analog signal interfacing.
- S-D4043 — Reliance PSC7000 MCIM-2 motion-control module for multi-axis motion applications.
