DS3800HDRA1B1B | Full Suffix Mark V Relay Output Card

Description

Product Introduction

The DS3800HDRA1B1B is the spring-cage terminal variant of the relay output board, with 0.8A fusing on the field supply. This board provides the same 16 Form C relays as the 1A1A, but the spring-cage terminals reduce termination time significantly—a key advantage during field installations where wiring labor is a cost driver. The 0.8A fuses provide better protection for the field supply rail than the 0.5A fuses on the 1A1A, reducing nuisance trips due to inrush currents on the field supply.

We’ve used the HDRA1B1B in a recent turbine retrofit project with over 100 wiring terminations across multiple boards. The spring-cage terminals saved about three hours of panel wiring compared to screw-clamp. The 0.8A fuses also gave us confidence that the board could handle the inrush from the field devices without nuisance trips. The relays are socketed, so if a relay fails, you can replace it without desoldering. This combination of features makes the 1B1B an attractive option for new installations and retrofit projects.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: Why does the HDRA1B1B have 0.8A fuses instead of 0.5A?
A: The 0.8A fuse provides better headroom for inrush currents on the field supply rail. Some field devices (like large contactors) can draw short-duration inrush currents that exceed 0.5A but are below 0.8A. The 0.8A fuse reduces nuisance trips while still providing adequate protection. GE introduced this rating in later revisions after field feedback indicated nuisance trips with the 0.5A fuses.

Q: How do the spring-cage terminals on the 1B1B compare to screw-clamp on the 1A1A?
A: Spring-cage terminals use a stainless steel spring to grip the wire, while screw-clamp uses a screw to tighten a clamping plate. Spring-cage is faster to terminate—push the wire in and it’s locked. Screw-clamp requires a screwdriver and torque control. Spring-cage is more resistant to vibration loosening, but requires ferrules for stranded wire. Screw-clamp is more tolerant of different wire types. The 1B1B is the preferred choice for new installations where wiring speed matters.

Q: Can I replace a single relay on the HDRA1B1B?
A: Yes, the relays are socketed. With the board powered off, gently pull the faulty relay out of its socket. Insert the new relay, ensuring correct orientation (the relay has a polarity marking on its top). This makes the HDRA1B1B a field-repairable board—a big advantage over boards with soldered-on components. We recommend stocking a few spare relays for quick replacements during outages.

Q: The status LEDs show the coil state. Does that indicate the actual contact state?
A: No. The LEDs show whether the coil is energized, which corresponds to the commanded state. However, they don’t show whether the contacts are actually making contact. If a relay is faulty, the LED could be on but the contacts may not be closed. Always verify the contact state with a multimeter. The LED is a logic indicator, not a contact verification.

Q: Can I switch 120V AC and 24V DC loads on the same HDRA1B1B?
A: Yes, the relays are isolated and can switch mixed loads. Each relay is independent, so you can have some channels switching 120V AC and others switching 24V DC. Just make sure the load current and voltage are within the relay’s rating. The terminals are labeled C (common), NO, and NC, so you can wire different voltages to different contacts.

Q: The HDRA1B1B has a 1.0A backplane current draw. Will that affect my power supply?
A: The Mark V power supply is typically rated at 6A on the 5V rail. The HDRA1B1B draws 1.0A, which is within the standard limit. However, if your rack has multiple HDRA boards, check your total backplane current. Three HDRA boards draw 3.0A, leaving 3.0A for other boards—you may be near the limit if your rack is fully populated. We recommend keeping total backplane current below 5.5A for margin.

Q: Does the HDRA1B1B have conformal coating?
A: Not by default. The 1B1B suffix indicates spring-cage terminals and 0.8A fusing, not coating. If you need conformal coating for harsh environments, look for a suffix with a “G” (e.g., DS3800HDRA1G1G). The standard HDRA1B1B is suitable for indoor environments. If your plant has high humidity or corrosive conditions, consider a coated variant.

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