National Instruments 778572-22 PXI Relay Module 

National Instruments part number 777687-26 is an identifying part number for the PXI-2522, a SPDT PXI Relay Module with 53 Channels and a maximum switching current limit of 2 A. It is a versatile switch module equipped with independent single‑pole double‑throw (SPDT) Form C armature relays, each boasting non latching functionality with minimal on-resistance and thermal offsets. Fully software programmable and featuring onboard relay count tracking, it offers a balanced combination of voltage/current capability and relay density, making it well-suited for automated test equipment (ATE) loads and for managing heaters, lights, and fans with efficiency.

 Additionally the NI 778572-22 is integrated with an intuitive front panel for seamless, ready-to-use functionality. This user-friendly interface allows users to configure the switch topology and adjust switch connections with ease through simple clicks. Additionally, users can utilize the Debug Driver session mode to monitor and troubleshoot the switch during automated measurements. For example, they can control active signal paths, individual relay statuses (open/closed), and track relay usage frequency. 

This relay module features three independent SPDT relays with a switching capacity of 2 A and a carrying capacity of 2 A, with a maximum voltage of 100 V. It is equipped with fully programmable software, onboard relay count tracking, and offers various termination options for DIN160 connectors. Additionally, it can configure the entire PXI system and provides access to view support resources. 

For this module the switching power is limited by the maximum switching current, the maximum voltage, and must not exceed 60 W, 62.5 VA. Switching inductive loads like motors and solenoids can generate high-voltage spikes that exceed the 777687-26's voltage rating. If not adequately protected, these spikes can disrupt module operation and reduce relay lifespan.