Foxboro RLY4 2500M/RLY4/XXXXX/XXXXXX 4-channel isolated relay output module

No. of Channels

4 (3 normally open + 1 changeover)

Maximum Current Rating

2 A at up to 240 V AC; 0.5 A at 200 V DC, increasing to 2 A at 50 V DC (resistive)

Minimum Ratings

AgCdO contacts offer the best operating life when switching more than 100 mA at 12 V

Fuse

3.15 A, 20 mm ceramic, time lag (T)

System Isolation

Reinforced, 264 V AC max

Channel Insulation

Functional, 264 V AC max

Contact Life

>10 million operations @ 250 V AC, 1 A RMS; >600,000 operations @ 250 V AC, 2 A RMS

De-rating

The above ratings summarize performance with resistive loads. Additional de-rating may be required for complex loads.

AC Voltage 

As the AC load becomes more “difficult” a more significant de-rating factor is required. The graph opposite shows the de-rating to be applied in terms of contact life, assuming the load requirement is pre-defined.

F1 Worst case

F2 Typical

DC voltage

DC operation is also limited for difficult loads, particularly where there is significant inductance. Here the working current must be limited as shown, where the load timeconstant (L/R, in ms) is the significant factor.

1

2

3

Q

How does the Foxboro RLY4 2500M/RLY4/XXXXX/XXXXXX optimize relay switching performance across both AC and DC load conditions?

A

The Foxboro RLY4 2500M/RLY4/XXXXX/XXXXXX features four relay outputs (three normally open and one changeover), supporting switching capacities of up to 2 A at 240 V AC and 2 A at 50 V DC (resistive) for versatile industrial control applications.

Q

What engineering characteristics enable the Foxboro RLY4 2500M/RLY4/XXXXX/XXXXXX to achieve exceptional relay endurance in mission-critical environments?

A

The Foxboro RLY4 2500M/RLY4/XXXXX/XXXXXX utilizes AgCdO relay contacts, providing a mechanical life exceeding 10 million operations under rated conditions and more than 600,000 operations at 250 V AC, 2 A RMS.

Q

Why is the Foxboro RLY4 2500M/RLY4/XXXXX/XXXXXX well-suited for electrically isolated industrial automation architectures?

A

The Foxboro RLY4 2500M/RLY4/XXXXX/XXXXXX incorporates reinforced 264 V AC system isolation and 264 V AC functional channel insulation, enhancing electrical separation, equipment protection, and operational reliability.

Q

Which protective design features are integrated into the Foxboro RLY4 2500M/RLY4/XXXXX/XXXXXX to improve operational safety and equipment longevity?

A

The Foxboro RLY4 2500M/RLY4/XXXXX/XXXXXX is equipped with a 3.15 A, 20 mm ceramic time-lag (T) fuse, offering dependable overcurrent protection while safeguarding the relay circuitry during transient operating conditions.

Q

How should engineers evaluate load de-rating when deploying the Foxboro RLY4 2500M/RLY4/XXXXX/XXXXXX in applications with inductive or complex loads?

A

The published ratings for the Foxboro RLY4 2500M/RLY4/XXXXX/XXXXXX are based on resistive loads. For inductive, capacitive, or other complex load profiles, additional de-rating should be applied to maintain optimal relay performance, switching reliability, and service life.

P0916NG 

FBM239 P0927AG

P0903CW

P0916VB

FBM241C P0914WM

P0914XB

P0916VC

P0903CV

P0926MX

P0916WE

P0922AE

P0916AA

P0916WF 

FBM1/37/43 P0400HH

FBM217 P0914TR

P0916VL

FBM2/36 P0500RG

FBM242 P0916TA

P0916VM 

FBM3A/33A P0500RU

P0916DB

P0916WG 

FBM4/39/44 P0500RY

CP60 P0961FR