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Morningstar Relay Driver Logic Module (RD-1)

Model: RD-1 · SKU: RD-1

Prepared Nov 12, 2026

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Common specifications

Device type	Logic module with four relay driver outputs (load control, generator start, alarm signaling)Source [1]
Communications	Not documented
Supported devices	TriStar MPPT 600V, TriStar MPPT, SunSaver MPPT, TriStar (PWM) and SunSaver Duo controllers; SureSine (Classic) inverter; MeterHub; other Relay DriversSource [1]
Ports	(2) RJ-11 MeterBus connections, (1) 9-pin serial RS-232, opto-isolatedSource [1]
Display	Not documented
Power input	12 to 48 V systems; operating voltage 8 to 68 V; self-consumption < 20 mASource [1]
Mounting	35 mm DIN rail or flat surfaceSource [1]
Enclosure	Type 1, indoor ratedSource [1]
Operating temperature	-40 to 45 °C-40 to 113 °F convertedSource [1]
Weight	0.2 kg0.44 lb convertedCalculatedSource [1]
Dimensions	33 D × 81 W × 163 L mm1.3 D × 3.2 W × 6.42 L in convertedCalculatedSource [1]
Enclosure volume	0.44 L** Calculated from recorded external dimensions
Warranty term	5 yearsSource [1]

All recorded specifications

Current rating	0.75 ACalculated750 mA / 1000 mA/A = 0.75 A Conditions Printed as "Max. Channel Current 750 mA", per relay driver channel (written in A). Location: PDF page 2, Electrical, Max. Channel Current Printed as "Max. Channel Current 750 mA", per relay driver channel (written in A). Location: PDF page 2, Electrical, Max. Channel Current Official datasheet · Morningstar Relay Driver datasheet (MS-003039 Rev 08/2024) (November 2, 2026 capture) [1]
Device type	Logic module with four relay driver outputs (load control, generator start, alarm signaling)Documented claim Conditions Printed as "Morningstar’s Relay Driver is a logic module which provides high level system control functions such as load control, generator start and alarm signaling." and "The product controls four independent relay driver outputs with battery voltage and other threshold settings in stand-alone mode or by reading digital data inputs from other Morningstar meterbus enabled devices in the system." Location: PDF page 1, description Printed as "Morningstar’s Relay Driver is a logic module which provides high level system control functions such as load control, generator start and alarm signaling." and "The product controls four independent relay driver outputs with battery voltage and other threshold settings in stand-alone mode or by reading digital data inputs from other Morningstar meterbus enabled devices in the system." Location: PDF page 1, description Official datasheet · Morningstar Relay Driver datasheet (MS-003039 Rev 08/2024) (November 2, 2026 capture) [1]
Dimensions	33 D × 81 W × 163 L mm1.3 D × 3.2 W × 6.42 L in convertedCalculated16.3 x 8.1 x 3.3 cm x 10 mm/cm = 163 x 81 x 33 mm Conditions Printed as "Length: 16.3 cm / 6.4 inch Width: 8.1 cm / 3.2 inch Depth: 3.3 cm / 1.3 inch"; length, width and depth as named. Location: PDF page 2, Mechanical, Dimensions Printed as "Length: 16.3 cm / 6.4 inch Width: 8.1 cm / 3.2 inch Depth: 3.3 cm / 1.3 inch"; length, width and depth as named. Location: PDF page 2, Mechanical, Dimensions Official datasheet · Morningstar Relay Driver datasheet (MS-003039 Rev 08/2024) (November 2, 2026 capture) [1]
Enclosure	Type 1, indoor ratedDocumented claim Conditions Printed as "Enclosure Type 1, indoor rated". Location: PDF page 2, Mechanical, Enclosure Printed as "Enclosure Type 1, indoor rated". Location: PDF page 2, Mechanical, Enclosure Official datasheet · Morningstar Relay Driver datasheet (MS-003039 Rev 08/2024) (November 2, 2026 capture) [1]
Mounting	35 mm DIN rail or flat surfaceDocumented claim Conditions Printed as "Mounts to a DIN rail or a flat surface." and "DIN Rail Attachment 35 mm standard". Location: PDF page 1, features; PDF page 2, Mechanical Printed as "Mounts to a DIN rail or a flat surface." and "DIN Rail Attachment 35 mm standard". Location: PDF page 1, features; PDF page 2, Mechanical Official datasheet · Morningstar Relay Driver datasheet (MS-003039 Rev 08/2024) (November 2, 2026 capture) [1]
Operating temperature	-40 to 45 °C-40 to 113 °F convertedDocumented claim Conditions Printed as "Operating Temperature –40°C to +45°C". Location: PDF page 2, Environmental, Operating Temperature Printed as "Operating Temperature –40°C to +45°C". Location: PDF page 2, Environmental, Operating Temperature Official datasheet · Morningstar Relay Driver datasheet (MS-003039 Rev 08/2024) (November 2, 2026 capture) [1]
Ports	(2) RJ-11 MeterBus connections, (1) 9-pin serial RS-232, opto-isolatedDocumented claim Conditions Printed as "Comm. Ports (opto-isolated) (2) RJ-11 meter bus connections (1) 9-pin serial RS-232". Location: PDF page 2, Electrical, Comm. Ports Printed as "Comm. Ports (opto-isolated) (2) RJ-11 meter bus connections (1) 9-pin serial RS-232". Location: PDF page 2, Electrical, Comm. Ports Official datasheet · Morningstar Relay Driver datasheet (MS-003039 Rev 08/2024) (November 2, 2026 capture) [1]
Power input	12 to 48 V systems; operating voltage 8 to 68 V; self-consumption < 20 mADocumented claim Conditions Printed as "System Voltage 12 to 48 volts" (the asterisk: the voltage of user selected relays must be the battery voltage), "Min. Operating Voltage 8 volts Max. Operating Voltage 68 volts" and "Self Consumption < 20 mA". Location: PDF page 2, Electrical Printed as "System Voltage 12 to 48 volts" (the asterisk: the voltage of user selected relays must be the battery voltage), "Min. Operating Voltage 8 volts Max. Operating Voltage 68 volts" and "Self Consumption < 20 mA". Location: PDF page 2, Electrical Official datasheet · Morningstar Relay Driver datasheet (MS-003039 Rev 08/2024) (November 2, 2026 capture) [1]
Supported devices	TriStar MPPT 600V, TriStar MPPT, SunSaver MPPT, TriStar (PWM) and SunSaver Duo controllers; SureSine (Classic) inverter; MeterHub; other Relay DriversDocumented claim Conditions Printed as "Compatible with: • TriStar MPPT 600V Controller • TriStar MPPT Controller • SunSaver MPPT Controller • Additional System Relay Drivers • TriStar (PWM) Controller • SunSaver Duo Controller • SureSine (Classic) Inverter • MeterHub". Location: PDF page 2, Compatible with Printed as "Compatible with: • TriStar MPPT 600V Controller • TriStar MPPT Controller • SunSaver MPPT Controller • Additional System Relay Drivers • TriStar (PWM) Controller • SunSaver Duo Controller • SureSine (Classic) Inverter • MeterHub". Location: PDF page 2, Compatible with Official datasheet · Morningstar Relay Driver datasheet (MS-003039 Rev 08/2024) (November 2, 2026 capture) [1]
Weight	0.2 kg0.44 lb convertedCalculated0.2 kg as printed Conditions Printed as "Weight 0.2 kg / 0.4 lb" (written in kg). Location: PDF page 2, Mechanical, Weight Printed as "Weight 0.2 kg / 0.4 lb" (written in kg). Location: PDF page 2, Mechanical, Weight Official datasheet · Morningstar Relay Driver datasheet (MS-003039 Rev 08/2024) (November 2, 2026 capture) [1]

Warranty

Warranty term	5 yearsDocumented claim Conditions Printed once as "Warranty: Five years warranty period.". The datasheet prints no further terms. Location: PDF page 2, Warranty Printed once as "Warranty: Five years warranty period.". The datasheet prints no further terms. Location: PDF page 2, Warranty Official datasheet · Morningstar Relay Driver datasheet (MS-003039 Rev 08/2024) (November 2, 2026 capture) [1]

Warranty term

5 yearsDocumented claim

Conditions

Printed once as "Warranty: Five years warranty period.". The datasheet prints no further terms.

Location: PDF page 2, Warranty

Printed once as "Warranty: Five years warranty period.". The datasheet prints no further terms.

Location: PDF page 2, Warranty

Official datasheet · Morningstar Relay Driver datasheet (MS-003039 Rev 08/2024) (November 2, 2026 capture)

[1]

Certificate records

No records documented.

Sources and revisions

Morningstar Relay Driver datasheet (MS-003039 Rev 08/2024) (November 2, 2026 capture)Official datasheet · Revision MS-003039 Rev 08/2024 · Checked Nov 1, 2026https://www.morningstarcorp.com/wp-content/uploads/datasheet-relay-driver-en.pdf