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This document provides a complete intra-brand and cross-brand interchange solution for Schneider Wingoal WATSNB-32-3 PC Class, 3P, 32A, R-iINT Controller automatic transfer switch (ATS). It includes detailed interchange compatibility analysis, model comparison tables, and practical operation precautions to ensure seamless replacement and safe, reliable operation of the electrical system.
- Core Interchange Benchmark Parameters
The key parameters of WATSNB-32-3 determine that interchangeable products must meet the following requirements:
| Parameter Category | Core Indicator | Interchange Requirement |
| Electrical Class | PC Class (no overcurrent protection, external circuit breaker required) | Must match; PC Class uses a load isolation switch as the executive component, with strong short-circuit withstand capacity |
| Pole Number/Current | 3P (3 poles), rated current 32A | Must be identical to ensure load matching |
| Rated Voltage/Frequency | 380V AC, 50Hz | Compatible with 400V/50Hz or 415V/60Hz products |
| Transfer Speed | Total transfer time ≤ 50ms | Must be ≤ 50ms to ensure uninterrupted power supply for sensitive equipment |
| Control Function | R-iINT intelligent controller (auto-transfer auto-reclose/auto-transfer non-reclose, overvoltage/undervoltage/phase loss monitoring, RS485 communication) | Functionally equivalent; at least basic monitoring and automatic transfer functions must be provided |
| Mechanical/Electrical Interlocking | Double interlocking, zero arc flash design | Must be equipped to prevent simultaneous connection of two power supplies |
| Mounting Method | Standard 35mm DIN rail, width approx. 63mm | Dimensionally compatible to avoid re-drilling or mounting position modification |
- Intra-brand Interchange Models of Schneider Wingoal (First Choice for Seamless Replacement)
Intra-brand interchange does not require modification of the installation scheme or control system, featuring the lowest risk and thus recommended as the first choice:
| Interchange Model | Core Matching Points | Difference Description | Interchange Advantage |
| WATSNA-32/3PCR | 3P, 32A, PC Class, R-iINT Controller | Slight differences only in executive components; electrical parameters are completely consistent | Same-series product, 100% compatible, no need to adjust control logic |
| WATSN-100/32/3H | 3P, 32A, PC Class, H Intelligent Controller | New-generation product; H controller has richer functions, with mechanical service life increased to 10,000 operations | Performance upgrade, optimized structure, stable supply |
| WTSH32-3N2 | 3P, 32A, PC Class, End-use Intelligent Controller | Mounting dimensions are completely consistent with WATSNB series; supports fire linkage | More cost-effective, low maintenance cost, suitable for end-use load applications |
| WATSGA-32/3R | 3P, 32A, PC Class, R-type Controller | Adopts C65 series load switch as the executive component, with mechanical service life of 8,000 operations | High market recognition, easy procurement of accessories, outstanding cost performance |
III. Cross-brand Interchange Model Comparison Table of Mainstream Brands (By Brand Category)
- ABB Brand Interchange Models
| ABB Model | Key Matching Parameters | Functional Equivalence | Mounting Compatibility |
| OTM32F3C 21D220C | 3P, 32A, PC Class, 21D Intelligent Controller (AC220V) | Total transfer time ≤ 50ms, overvoltage/undervoltage/phase loss/frequency monitoring, mechanical service life of 10,000 operations | Standard DIN rail, width compatible (approx. 63mm) |
| DPT160-PC010 R32 3P | 3P, 32A, PC Class, PC010 Controller | Isolation switch as executive mechanism, double interlocking, supports generator linkage | Slightly wider (approx. 75mm); mounting space adjustment may be required |
Interchange Note: The parameter setting interface of ABB controller is different from that of Schneider R-iINT; it is necessary to reconfigure overvoltage/undervoltage thresholds and transfer modes.
- Chint Electric Interchange Models
| Chint Model | Key Matching Parameters | Functional Equivalence | Mounting Compatibility |
| NH40-32/3SZ PC Class | 3P, 32A, PC Class, Intelligent Controller | Three-stage transfer mechanism, transfer time ≤ 50ms, fire linkage, mechanical service life of 8,000 operations | Fully compatible with 35mm DIN rail, consistent width |
| NXZN-63/32/3 PC Class | 3P, 32A, PC Class, Intelligent Controller | AC-33B utilization category, flexible contact, RS485 communication | Mounting dimensions consistent with Schneider products, direct replacement available |
Interchange Advantage: Priced at only 60%-70% of Schneider products; a leading domestic brand with short supply cycle.
- Delixi Electric Interchange Models
| Delixi Model | Key Matching Parameters | Functional Equivalence | Mounting Compatibility |
| CDQ0s-80/3-32D PC Class | 3P, 32A, PC Class, D-type Intelligent Controller | Auto-transfer auto-reclose/auto-transfer non-reclose, overvoltage/undervoltage/phase loss monitoring, transfer time ≤ 50ms | Standard DIN rail, dimensionally compatible |
| CDQ1F0632P032A2 | 3P, 32A, PC Class, Intelligent Controller | Two-stage transfer mechanism, power-off time ≤ 0.1s, modular contact | Consistent mounting dimensions, better heat dissipation performance |
Interchange Advantage: Comprehensive after-sales service network, suitable for projects with limited budgets.
- Siemens Brand Interchange Models
| Siemens Model | Key Matching Parameters | Functional Equivalence | Mounting Compatibility |
| 5TR1324-7CC32 PC Class | 3P, 32A, PC Class, Intelligent Controller | Three operating modes (auto-transfer auto-reclose/auto-transfer non-reclose/mutual backup), double interlocking | Standard DIN rail, width approx. 63mm, direct replacement available |
Interchange Advantage: Good compatibility with Siemens PLC, frequency converter and other equipment, suitable for large-scale industrial projects.
- In-depth Interchange Compatibility Analysis
- Electrical Parameter Compatibility
| Parameter | WATSNB-32-3 Specification | Interchange Product Requirement | Common Differences & Solutions |
| Rated Short-time Withstand Current | Icw≥1500A (1s) | ≥1500A | Select PC Class products to ensure short-circuit withstand capacity |
| Control Voltage | AC220V/DC24V optional | Match the control voltage of the original system | If controller voltage differs, replace the control power supply or use an adapter |
| Utilization Category | AC-33B/AC-33iB | At least AC-33B | Ensure ability to withstand motor load impact |
| Communication Protocol | ModBus RTU (RS485) | Support ModBus or provide protocol conversion | Ensure communication compatibility if integration with BMS is required |
- Mechanical and Mounting Compatibility
| Item | WATSNB-32-3 Specification | Interchange Product Requirement | Mounting Precautions |
| Width | Approx. 63mm (2 modules) | Within ±5mm range | If exceeding the range, adjust mounting position or replace busbar |
| Height | Approx. 100mm | No interference with adjacent equipment | Ensure ≥15mm heat dissipation space above the device |
| Depth | Approx. 120mm | No protrusion beyond the distribution box depth | Avoid interference with rear terminal blocks |
| Terminal Block | Suitable for wire cross-sectional area 1.5-16mm² | Compatible with the same wire diameter | Ensure firm wiring with torque complying with specifications |
- Functional and Control Compatibility
| Function | WATSNB-32-3 Feature | Minimum Requirement for Interchange Products | Configuration Key Points |
| Transfer Mode | Auto-transfer auto-reclose (default)/auto-transfer non-reclose | At least two modes available | Set according to original system requirements; auto-transfer non-reclose is recommended for generator backup power supply systems |
| Fault Monitoring | Overvoltage, undervoltage, phase loss, frequency anomaly | Must be equipped with basic monitoring functions | Set thresholds consistent with the original system (e.g., undervoltage ≤ 85%Un, overvoltage ≥ 110%Un) |
| Fire Linkage | Forced neutral position function | Support passive contact input | Ensure correct connection of fire signals to the controller |
| Manual Operation | Emergency manual transfer + padlocking function | Must be equipped | Ensure the position of the operating mechanism is consistent with the original system |
- Interchange Implementation Steps and Safety Precautions
- Preparation Work
- Confirm that the technical parameters of the interchange product are completely matched with the original product (focus on checking PC Class, 3P, 32A, and transfer time ≤ 50ms)
- Prepare tools: screwdriver, multimeter, insulating gloves, voltage tester, terminal crimping tool
- Back up original system parameters: record overvoltage/undervoltage thresholds, transfer delay time, communication address, etc., of the R-iINT controller
- Apply for power outage permission and formulate an emergency response plan
- Replacement Operation Process
- Power Off and Voltage Testing: Disconnect the main and backup power supplies; after verifying no voltage, hang grounding wires and warning signs
- Remove the Original Equipment: Mark the terminal blocks (normal power supply L1/L2/L3, backup power supply L1/L2/L3, load L1/L2/L3, control power supply, communication lines), then remove the old ATS
- Install the New Equipment: Fix it in the original position, ensuring firm clamping on the DIN rail and stable installation
- Wiring: Wire according to the marked correspondence, ensuring correct phase sequence and torque complying with specifications (1.5-2.5N·m)
- Parameter Configuration: Set the new controller according to the original system parameters and test the communication function (if applicable)
- Function Test:
Manual transfer test: Confirm normal switching between normal → backup → normal power supply without jamming
Automatic transfer test: Simulate main power supply undervoltage/phase loss to verify transfer action and time (≤ 50ms)
Interlocking test: Ensure no simultaneous connection of two power supplies and zero arc flash
Fire linkage test: Trigger the forced neutral position function to confirm disconnection of both power supplies
- Key Safety Points
- Live Operation is Strictly Prohibited: PC Class ATS has no overcurrent protection and must be installed in a completely power-off state
- Phase Sequence Consistency: The phase sequence of normal power supply, backup power supply and load side must be completely consistent to avoid equipment reverse rotation
- Double Interlocking Verification: After installation, it is necessary to test the electrical and mechanical interlocking functions to eliminate potential safety hazards
- Independent Control Power Supply: It is recommended to power the controller with an uninterruptible power supply (UPS) to ensure normal operation of monitoring and control functions
- Label Update: Replace equipment identification and record the new equipment model, serial number and replacement date
- Interchange Selection Decision Matrix (Quick Selection Guide)
| Application Scenario | Recommended Interchange Model | Selection Reason |
| Medical Equipment/Data Center (High Reliability) | Schneider WATSN-100/32/3H or ABB OTM32F3C 21D220C | Long mechanical service life (10,000 operations), fast transfer speed, complete communication functions |
| Industrial Automation (Motor Load) | Chint NXZN-63/32/3 or Delixi CDQ1F0632P032A2 | AC-33B utilization category, capable of withstanding starting impact, moderate price |
| Commercial Building (Limited Budget) | Chint NH40-32/3SZ or Delixi CDQ0s-80/3-32D | High cost performance, basic functions meet requirements, excellent after-sales service |
| Generator Backup Power Supply System | Schneider WATSNA-32/3PCR or ABB DPT160-PC010 R32 | Supports auto-transfer non-reclose mode, suitable for generator linkage |
| Fire Protection System (Forced Neutral Position Requirement) | Schneider WTSH32-3N2 or Siemens 5TR1324-7CC32 | Complete fire linkage functions, complying with specification requirements |
Summary
There is a wide range of interchangeable products for WATSNB-32-3 PC Class R-iINT. Intra-brand interchange (e.g., WATSNA-32/3PCR) is the most reliable option, while cross-brand interchange (e.g., ABB OTM32F3C, Chint NH40-32/3SZ) requires focused verification of electrical parameters, mounting dimensions and functional compatibility. Regardless of the selected scheme, the three core principles of power-off operation, double interlocking verification, and parameter matching must be followed to ensure the safe and reliable operation of the electrical system.
