G4Q-TR2A

Description

A 16-point transistor output module (NPN, sink type) for LS GLOFA/G4 controllers, rated for DC 12/24 V and 0.5 A per point. It’s the compact solid-state alternative to relay outputs when you want faster switching and longer mechanical life.

The Polar Energy Assessment:

G4Q-TR2A provides sixteen NPN (sink) transistor outputs intended for standard DC loads such as small solenoids, indicator lamps, and drive enable lines. Because it uses photo-coupler isolation between the outputs and the backplane, it helps reduce noise and protect the CPU from transients, while the 0.5 A per-point rating keeps the device useful for moderate loads that don’t require relay switching. Typical installations use one common per group for aggregated current limits, so watch the COM rating when many outputs are used simultaneously.

Pros

• Faster switching and longer life than mechanical relays.
• Photo-coupler isolation improves noise immunity.
• 16 outputs in one module gives decent density for small panels.

Limitations

• 5 A per point limits you to moderate loads; heavy actuators still need relays or driver stages.
• NPN sink wiring requires attention to common polarity and load wiring practices.

Typical use cases

• Driving small DC solenoids, lamps, logic inputs on motor drives, or enable/disable lines in machine control.
• OEM panels where faster, wear-free output switching is required.
• Retrofit projects replacing aging relay modules with solid-state outputs.