Pulse Isolation Relay

SPR-2

The SSI SPR-2 Pulse Isolation Relay provides two sets of isolated, dry solid state Form C (K, Y & Z) contacts from a single field-selectable Form A or C input across a wide voltage range. A solid state output equivalent of the RPR-2PS, the SPR-2 supplies a +13 VDC sense voltage to the sending device and is compatible with meters using high or low voltage semiconductor outputs as well as mechanical relay contacts.

Typical applications include interfaces between utility metering devices and customer-owned energy control systems, demand recorders, and supervisory control (SCADA) systems. With two isolated output channels derived from a single input, the SPR-2 is ideal for installations where the same pulse signal must simultaneously drive multiple downstream devices or systems.

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Instructions
The SPR-2 Pulse Isolation Relay on a white background.

Product Highlights

The SPR-2 is engineered for noise immunity and long-term reliability in utility metering environments. Input filtering circuitry rejects pulses shorter than 18 ms to prevent false triggering, while built-in MOV transient protection on the solid state relay contacts eliminates the need for external suppression components. Each “K” output lead is individually fused at 1/10 amp to protect against excessive current and wiring errors. Bright red and green LED indicators provide continuous system status at a glance, without requiring any additional test equipment.

Designed with installer and operator safety in mind, the SPR-2 features a “Euro” style terminal strip that keeps all conductive parts recessed when wiring is properly installed. All powered components — except the terminal strip — are housed within a polycarbonate cover, and the polycarbonate mounting base plate provides excellent electrical insulation between the circuit and the mounting surface. The SPR-2 mounts in any position inside a user-supplied enclosure suitable for the intended application.

Features

The SPR-2 provides two simultaneous isolated pulse outputs for utility metering and energy management applications.
  • Two sets of isolated solid state Form C (K, Y & Z) dry contacts from a single field-selectable Form A or C input
  • Switch-selectable Form A or Form C input with no additional hardware required
  • Input noise filtering rejects pulses shorter than 18 ms to eliminate false triggers
  • Solid state contacts rated at 125 VAC/VDC at 100 mA with a maximum power rating of 800 mW
  • Built-in MOV transient protection on solid state relay contacts
  • Fused "K" output leads (1/10 amp, 3AG) on each output channel
  • 2,500Vrms input/output isolation voltage
  • Red and green LED status indicators for at-a-glance system monitoring
  • "Euro" style terminal strip with no exposed conductive parts when wiring is properly installed
  • Operating temperature range of -38°C to +70°C (-38.4°F to +158°F)
  • Available models: 120–277 VAC, 125 VDC (SP2), 12 VDC (SP6), and 13–48 VDC (SP13) power supply inputs
The SPR-2 Pulse Isolation Relay

Dual Isolated Solid State Relay

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