Description
The FieldPoint model FP-RLY-420, part number 777518-420, is an 8-channel, single-pole, single-throw (SPST) relay output module. It is designed to provide reliable and efficient control for various applications but is noted as “Not for New Design”. Each channel on this module can support a switching capacity of up to 3 amperes and operates at a voltage of either 35 VDC or 250 VDC.
This module comes equipped with NO (Normally Open) and IC (Input Common) terminals for each of its 8 channels. For added convenience, the Vsup (Supply Voltage) and COM (Common) terminals are internally connected within the module. Protection is a key feature of the FP-RLY-420, offering a fast-acting, 3 A, 250 V fuse at the IC terminal to safeguard against unexpected electrical surges.
The relay type utilized in this module is the electromechanical SPST relay, which defaults to an off state upon power-on. This ensures a safe startup and minimizes the risk of unintended operations. The effective resistance between the IC and NO terminals is approximately 150 mΩ, ensuring minimal energy loss during operation. Integrated protection MOVs (Metal Oxide Varistors) are included to further enhance the module’s resilience against voltage spikes.
Isolation is another critical aspect of the FP-RLY-420, with 250 Vrms continuous isolation provided between the inter-module communication bus and the backplane. This feature helps to prevent electrical noise and interference from affecting the performance of the module. Users can expect high-quality relays that support a maximum switching frequency of 20 operations per second, with electrical switching frequency capped at 1 operation per second at maximum load to ensure reliability and longevity.
The rated operate time for this module is 8 milliseconds, with a release time and bound time of 4 milliseconds each. This swift response time ensures that the FP-RLY-420 can meet the demands of applications requiring quick switching actions without compromising on performance or safety.
| Specification | Detail |
|---|---|
| Part Number | 777518-420 |
| Category | FieldPoint |
| Model | FP-RLY-420 |
| Description | 8 ch SPST Relay Output Module (Not for New Design) |
| Channels | 8-Channel, SPST Type |
| Switching Capacity | Up to 3 amperes |
| Operating Voltage | 35 VDC or 250 VDC |
| Terminals per Channel | NO and IC |
| Internal Connections | Vsup and COM terminals are internally connected |
| Protection | Fast-acting, 3 A, 250 V fuse at the IC terminal |
| Relay Type | Electromechanical (SPST) relays |
| Power-On State | Off |
| Effective Resistance | Approx. 150 mΩ between IC and NO terminals |
| Protection Feature | Integrated protection MOVs |
| Isolation | 250 Vrms continuous between inter-module communication bus and backplane |
| Quality | High-quality relays |
| Max Switching Frequency | 20 operations per second |
| Electrical Switching Frequency | 1 operation per second at maximum load |
| Rated Operate Time | 8 ms |
| Release Time | 4 ms |
| Bound Time | 4 ms |
Question 1: What is the switching capacity of FP-RLY-420?
Answer 1: 3A
Question 2: How many channels does the FP-RLY-420 have?
Answer 2: 8 channels
Question 3: What is the isolation voltage for FP-RLY-420?
Answer 3: 250 Vrms
Question 4: What type of relay is used in FP-RLY-420?
Answer 4: SPST electromechanical relay
Question 5: What is the rated operate time of FP-RLY-420?
Answer 5: 8 milliseconds
