Description
The Hager HR551 is a single-channel digital type B differential relay, ideal for industrial or civil installations with sensitive electronic components.
It is installed on a DIN rail using 3 DIN modules and has an LCD display for monitoring, management and programming.
The intervention threshold is adjustable between 30 mA and 3 A, while the delay time can be set from 0.1 s up to 10 s. It includes advanced functions such as a pre-alarm visible on the display, digital output, remote activation input (TRIP), and RS-485 connectivity with Modbus RTU protocol.
The relay is compatible with HR72x series toroids, depending on the circuit current rating, is RoHS compliant, with REACH declarations and is halogen-free.
Datasheet
• Sensitivity 30 mA, 100 mA, 300 mA, 500 mA, 1 A, 3 A
• Adjustable intervention delay from 0.1 s to 10 s
• 3 DIN modules on 35 mm DIN rail
• LCD display functions, pre-alarm, digital output, TRIP input, RS-485 Modbus
• Power supply 230 V AC, 50/60 Hz; consumption ≈7.5 VA
• Type B protection (also direct current and high frequency)
• Compatibility with HR721, HR722, HR723, HR724 toroids
• Dimensions ≈118 × 52 × 74 mm
• RoHS, REACH, halogen-free environmental certifications
Properties
