Description
1. At-A-Glance Executive Brief
- Model: 8920-PS-DC-02
- Brand: GE / MTL Instruments (PAC8000 SafetyNet Series)
- Part Type: Intrinsically Safe (IS) DC Power Supply Module
- Lifecycle Status: Legacy / Obsolete (Maintained via certified surplus channels)
- System Compatibility: PAC8000 SafetyNet controllers, 8724-CA-PS carrier mounting bases
- Core Protocol: Galvanically isolated 12V DC power distribution for IS field I/O modules
2. Technical Introduction
Process facilities running legacy GE/MTL PAC8000 SafetyNet architectures in hazardous locations often face sudden loop dropouts when aging power distribution electronics suffer from thermal fatigue. Instrumentation teams troubleshooting intermittent faults in Class 1 Division 2 zones cannot afford prolonged downtime or unverified hardware replacements that risk safety controller trips. The GE/MTL 8920-PS-DC-02 mounts directly onto existing 8724 carrier bases to supply clean, galvanically isolated power, eliminating voltage sag and maintaining system loop integrity without requiring cabinet footprint adjustments.
3. Core Technical Specifications
| Parameter | Value |
| Manufacturer | GE / MTL Instruments |
| Product Family | PAC8000 SafetyNet |
| Input Voltage Range | 18.5V DC to 36V DC (24V DC nominal) |
| Nominal Output Voltage | 12V DC (± 5%) |
| Maximum Output Current | 5.0 A |
| Input/Output Isolation | 250V AC RMS continuous (tested to 1500V AC RMS) |
| Redundancy Support | Active load sharing for dual-module configurations |
| Carrier Mounting | Type 8724-CA-PS carrier base |
| Hazardous Area Approvals | Class I, Div 2, Groups A-D; Zone 2 IIC T4 |
| Operating Temperature | -20°C to +60°C |
| Weight | 1.29 kg |
4. Field Engineer’s Tech Notes
- Redundant Load Sharing Configuration: When pairing two modules on a single carrier for redundancy, verify that load-balancing parameters and backplane jumpers are properly aligned. Uneven current draw across dual supplies accelerates thermal wear on the primary unit and can trigger premature current-limit throttling.
- Terminal Block Torque Limits: The dual-section screw terminals accommodate up to 2.5 mm² wiring. Always utilize a calibrated torque screwdriver during installation to prevent high-resistance joints, which introduce localized hot spots and voltage drop under peak 5A loads.
5. Adaptive QA & Testing Protocol
Our testing workflow for the 8920-PS-DC-02 targets electrical safety under active load conditions. We seat the unit onto a live PAC8000 test carrier to verify input-to-output galvanic isolation up to 1500V AC RMS. Technicians step the module up to its full 5.0A output capacity while logging voltage ripple, regulation tolerances, and thermal stability. Redundant load-sharing handshakes and overcurrent trip responses are fully verified prior to generating our formal QA test report, which is available upon request.
6. Buyer’s FAQ
- Q: What condition options are available for this replacement part?A: We stock this unit in factory-sealed New Surplus (NSFP) and rigorously bench-tested refurbished conditions to suit your plant’s maintenance schedule.
- Q: Does this module include operational warranty protection?A: Yes, every unit is delivered with a comprehensive 12-month warranty covering all internal hardware components.
- Q: How fast can this power module ship during an emergency shutdown?A: Same-day priority dispatch is available from our domestic inventory warehouses to mitigate costly process downtime.
- Q: Is this exact variant a drop-in replacement for older PAC8000 installations?A: Yes, it preserves exact mechanical dimensions and electrical pinouts for standard 8724 carrier mounting bases, allowing seamless installation without engineering modifications.
