Application Scenarios
Imagine a 400 V main distribution board in a water treatment plant, where an ABB Tmax XT2 MCCB protects a critical raw water pump feeder. During a routine SCADA audit, the control room operator notices that the pump’s “Breaker Closed” status shows a grayed-out “unknown” state—the original auxiliary contact block has mechanically failed after 15 years of thermal cycling, leaving the PLC without a definitive status signal for its auto-start interlock logic.
The maintenance electrician arrives at the panel with a replacement ABB 1SDA064796R1. Without disconnecting the heavy copper busbars or de-energizing the main bus (which would require a full plant shutdown), they isolate the individual MCCB by racking it out or disconnecting the load, snap the failed accessory out of the breaker’s side slot using a small flat-blade screwdriver, and click the new 1SDA064796R1 into the same dedicated accessory channel. Within 10 minutes, the contact block’s SPDT contacts are feeding the correct ON/OFF status to the PLC, and the pump’s automatic start sequencing logic is fully restored—all with zero disturbance to adjacent circuits.
This scenario highlights the 1SDA064796R1‘s core value proposition: it solves the common pain point of aged MCCB accessories in live industrial panels, allowing plants to refresh only the worn control element while preserving the certified protection device and its bolted terminations, avoiding the time and cost of a full breaker replacement.
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1SDA064796R1 (SACE Tmax 1SDA06 Accessory Series) |
| Manufacturer | ABB |
| Product Category | MCCB Accessory — Auxiliary Switch Block / Control Module (clip-on side mount) |
| Compatible Breakers | ABB SACE Tmax XT1, XT2, XT3, XT4 (also selected Tmax T7 frames — verify per breaker type) |
| Function | Auxiliary contact (typically 1NO+1NC or SPDT), or shunt/UV release / motor operator control per subtype |
| Contact Arrangement | SPDT or 1NO+1NC (configuration varies by order code variant) |
| Contact Rating | 16 A @ 24 V DC / 6 A @ 250 V AC (typical auxiliary contact rating) |
| Operating Voltage | 24–30 V AC/DC (for low-power control applications) |
| Mounting Method | Clip-on / slide-in to dedicated left or right accessory slot on Tmax XT breaker — tool-free for the module (terminal screws require small flat-blade) |
| Electrical Life | ≥ 10,000 operations @ rated load (auxiliary contact block) |
| Mechanical Life | ≥ 100,000 operations (auxiliary contact block) |
| Operating Temperature | -25 °C to +70 °C |
| Protection Class | IP20 (when installed inside breaker assembly) |
| Dimensions (Approx.) | 100 mm × 100 mm × 20 mm (module housing) |
| Weight (Approx.) | 0.2 kg |
| Standards / Certifications | IEC 60947-1 / IEC 60947-2, CE, CCC, UL |
Technical Principles and Innovative Values
Innovation Point 1 — Tool-Free Clip-On Side Mounting for Rapid Retrofit
The ABB 1SDA064796R1 is engineered with a molded dovetail channel that snaps positively into the pre-machined accessory slot of any compatible Tmax XT breaker. No disassembly of the MCCB frame, no removal of busbar connections, no special tools—this modular “add-as-needed” design lets panels be commissioned with minimal accessories initially and upgraded later without de-energizing adjacent circuits.
Innovation Point 2 — Positive Mechanical Linkage to Breaker Operating Mechanism for True TRIP Detection
Unlike generic add-on microswitches that sense only the position of the handle, the ABB 1SDA064796R1 couples directly to the breaker’s internal operating shaft or trip bar. This means it can distinguish a true TRIP condition (mechanically latched fault position) from a manually operated OFF state—a critical distinction for DCS alarm logic that must differentiate a protective trip requiring investigation from an operator-initiated open command.
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