Description
The part number initially listed as 185151B-01 is incorrect, and the correct part number for this product is 777518-420. This component falls under the category of FieldPoint and is identified by the model FP-RLY-420. It is an 8-channel SPST Relay Output Module, which is noted as not being suitable for new design projects. Each of the channels in this module operates as a Single Pole Single Throw (SPST) relay.
The module features 8 channels in total, with a switching capacity of up to 3 amperes at either 35 VDC or 250 VAC. For each channel, there are Normally Open (NO) and Internal Connection (IC) terminals available. Notably, the Vsup and COM terminals are interconnected internally within the device.
To protect the module, it is recommended to use a fast-acting, 3 A, 250 V fuse at the IC terminal. The relays employed in this module are electromechanical SPST relays, which default to the off position upon power-up. The effective resistance measured between the IC and NO terminals is approximately 150 mΩ.
For added durability and safety, the module includes integrated Metal Oxide Varistors (MOVs). It also boasts an isolation rating of 250 Vrms continuous between the communication bus and the backplane. The maximum switching frequency of the module is 20 operations per second, but when operating at maximum load, the electrical switching frequency is limited to 1 operation per second.
The rated operate time for the relays is 8 milliseconds, with a release time of 4 milliseconds and a bound time also of 4 milliseconds. This technical specification underscores the module’s capability for rapid switching operations while ensuring robust protection and isolation measures are in place.
| Property | Specification |
|---|---|
| Part Number | 185151B-01 (Incorrect in Description, Correct: 777518-420) |
| Category | FieldPoint |
| Model | FP-RLY-420 |
| Description | 8 ch SPST Relay Output Module (Not for New Design) |
| Channel Type | SPST |
| Number of Channels | 8 |
| Switching Capacity | 3 amperes at 35 VDC or 250 VAC |
| Terminals per Channel | NO and IC |
| Internal Connections | Vsup and COM terminals are connected internally |
| Fuse Requirements | Fast-acting, 3 A, 250 V fuse at the IC terminal |
| Relay Type | Electromechanical (SPST) relays |
| Power-On State | Off |
| Effective Resistance | Approximately 150 mΩ between the IC and NO terminals |
| Protection | Integrated MOVs |
| Isolation | 250 Vrms continuous between communication bus and backplane |
| Maximum 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 correct part number for FP-RLY-420?
Answer 1: The correct part number is 777518-420.
Question 2: How many channels does FP-RLY-420 have?
Answer 2: It has 8 SPST relay output channels.
Question 3: What is the switching capacity of FP-RLY-420?
Answer 3: Up to 3A at 35VDC or 250VAC.
Question 4: What is the maximum switching frequency?
Answer 4: 20 operations per second.
Question 5: What type of protection does FP-RLY-420 include?
Answer 5: Integrated MOVs for durability.
