Overview
The Sigma 42RO-500G-SIL is a dual-pole double-throw (DPDT) general-purpose relay engineered for industrial control and switching applications. This plug-in relay features an 8-pin octal socket configuration and meets the electrical requirements of legacy and modern automation systems. As a Sigma relay, it combines proven reliability with cost-effective functionality for controls technicians, system integrators, and maintenance professionals.
Key Features
- DPDT (Double Pole Double Throw) contact configuration with two independent switching circuits
- 5A contact rating at 28VDC and 120VAC operating voltages
- 8-pin octal plug-in design for fast installation and replacement
- Gold contact material for superior conductivity and corrosion resistance
- Compact dimensions: approximately 1.25″ × 1.25″ × 2.5″ length
- 60Hz rated for standard industrial frequency applications
Technical Specifications
| Contact Rating (Resistive Load) | 5A |
| Coil Voltage | 120VAC (standard) / 28VDC capable |
| Operating Voltages | 28VDC/120VAC, 16VDC/65VAC |
| Frequency | 60Hz |
| Contact Configuration | DPDT (Double Pole Double Throw) |
| Contact Material | Gold |
| Number of Pins | 8-pin octal |
| Mounting | Plug-in octal socket |
| Physical Dimensions | 1.25″ W × 1.25″ D × 2.5″ L |
| Manufacturer | Sigma Instruments / Magnecraft |
| Part Number | 42RO-500G-SIL |
Typical Applications
- Industrial motor control circuits and soft starters
- Process automation switching and interlocking
- HVAC and facility control systems
- Equipment sequencing and alarm circuits
- Legacy control panel restoration and repair
- General-purpose switching in DC/AC circuits up to 5A
Compatibility & Replacements
Compatible With
- 8-pin octal relay sockets and bases
- Industrial control panels and cabinets
- AC/DC switching circuits and automation systems
- Magnecraft relay chassis and mounting systems
Replaces / Drop-In Replacement For
- Sigma 42RO-500-S-SIL (variant with slightly different coil specifications)
- Other Sigma 42-series DPDT relays with similar 8-pin octal footprint
- Magnecraft equivalent DPDT 5A relays in legacy applications
Works With
- 8-pin octal relay sockets (standard industrial configuration)
- AC and DC control circuits (28VDC/120VAC, 16VDC/65VAC)
- General-purpose control logic and switching networks
- Automation systems requiring DPDT switching capability
