Tigo RSS Transmitter Single Core 490-00000-51 (DIN Rail, Pure Signal Technology)

The Tigo RSS Transmitter Single Core 490-00000-51 is a DIN rail-mounted rapid shutdown activator that delivers module-level deactivation for solar arrays using Tigo TS4-A-F/2F MLPE. Measuring 3.58 × 1.5 × 1.63 in. (90.9 × 38 × 41.3 mm) and weighing just 0.013 lbs. (60 g), it uses powerline communications (PLC) to send a keep-alive signal through a single core to PV string conductors, meeting NEC 690.12 rapid shutdown requirements across multiple code cycles. Featuring Tigo's patented Pure Signal™ technology, the 490-00000-51 syncs one coordinated signal across up to 10 linked transmitters to eliminate crosstalk in multi-array installations.

Key specifications

• Input voltage: 12 VDC ±2%; 1 A max; 5.5 W max / 0.85 W avg power consumption; 0.06 W standby
• Core capacity: single core; up to 10 PV string conductors per core; up to 10 strings/core; up to 30 modules/string; 160 A max per core; 1500 VDC max string voltage
• Sync capability: up to 10 synced transmitters; max 30 m (100 ft) cable to last transmitter in series
• Core specs: 18 AWG conductors; 500 mm (19.7 in.) conductor length; 160 g (0.35 lbs.) core weight
• Physical & certifications: DIN rail mount (TS35/7.5 or TS35/15); -40°F to 185°F (-40°C to 85°C); UL Listed, NEC, FCC, IC, CE, UKCA certified

Rapid shutdown without the complexity

When a fire or emergency requires a rooftop array to be de-energized, string-level shutdown leaves conductors live at dangerous voltages throughout the array boundary — a hazard to first responders and a code violation under NEC 2017, 2020, and 2023 Section 690.12. Paired with Tigo TS4-A-F or TS4-A-2F units, the RSS Transmitter sends a PLC keep-alive signal through the single core encircling up to 10 string conductors; when that signal is interrupted — automatically on grid loss or manually via an external switch — each TS4 unit deactivates at the module level, bringing conductor voltage down to safe levels within seconds. Tigo's patented Pure Signal™ technology ensures that where multiple transmitters are synced across adjacent arrays, all transmitters operate from one coordinated signal, preventing crosstalk-induced false shutdowns.

Key Applications

• Residential rooftop NEC compliance — provides module-level rapid shutdown for homes with TS4-A-F/2F units; a single-core transmitter handles up to 10 strings with up to 30 modules each, covering most residential array sizes in one unit.
• Commercial multi-array installations — up to 10 transmitters can be synced via Pure Signal technology, allowing large commercial rooftops with multiple sub-arrays to operate under one coordinated shutdown signal.
• Inverter-agnostic deployments — compatible with most inverters on the market, making the 490-00000-51 a practical rapid shutdown solution regardless of the inverter brand already specified for the project.
• DIN rail panel builds — the standalone DIN rail module format is the right choice when the power supply and enclosure are already specified; for sites that need everything bundled, the 492-00000-51 adds a 120/240 VAC power source and outdoor enclosure.
• Scalable utility and C&I projects — the sync architecture scales from a single residential transmitter up to large utility installations without changing hardware generations or firmware platforms.

Powering and installing the RSS Transmitter

The 490-00000-51 requires an external 12 VDC ±2% power source at up to 1 A — not included with the standalone unit. The single core (18 AWG, 500 mm conductor) encircles up to 10 PV string conductors of the same polarity (negative or positive only); the bi-colored core design ensures consistent polarity orientation during installation. Multiple transmitters in the same installation connect to each other via a sync cable, up to 30 m (100 ft) to the last unit in the series, with up to 10 transmitters linkable in a synced group. For outdoor installations, an IP67/NEMA 3R enclosure must be sourced separately — the 492-00000-51 bundles the transmitter, DIN rail power supply, and outdoor enclosure for sites where all three components are needed together. The PCBA variant (490-00100-51) is available for integrators embedding the transmitter directly into an inverter or custom panel.

Why choose the Tigo RSS Transmitter Single Core 490-00000-51?

The 490-00000-51 delivers full NEC 690.12 compliance across the 2017, 2020, and 2023 code cycles without locking the installer into a proprietary inverter ecosystem — its compatibility with most inverters on the market makes it a reliable specification regardless of system architecture. The standalone DIN rail format keeps cost efficient for custom panel builds and replacement scenarios where a power supply and enclosure are already in place. And where installations grow to span multiple arrays, Pure Signal™ technology eliminates the crosstalk risk that can cause nuisance shutdowns in multi-transmitter systems — a protection that becomes especially important on larger commercial and utility rooftops.