For Sale by MRO Exchange
Description
Product Specifications
- Manufacturer: Allen-Bradley (Rockwell Automation)
- MPN / Model: 440R-S35014
- Model Name: MSR 55P
- Product Type: Safety Relay, Back EMF / Standstill Monitor
- Catalog Number: 440R-S35014
- Series: A
- Supply Voltage: 24V DC, 3W
- Contact Configuration: 3 N.O. Safety / 1 N.C. Auxiliary (B 300 pilot duty)
- Contact Rating (40°C): 5A 250Vac G.P., 5A 24Vdc
- Contact Rating (60°C): 2A 250Vac G.P., 2A 24Vdc
- Ambient Temperature: 60°C
- Country of Origin: Germany
- Certifications: UL Listed (US IND. CONT. EQ. 4B51), CE, EAC, TV
- UPC: 194033055202
- Lot No.: 2023/04/24 28195
- PN: 533949
Product Description
The Allen-Bradley Guardmaster MSR 55P is a back EMF standstill monitoring safety relay identified by catalog number 440R-S35014, Series A. Manufactured by Rockwell Automation and made in Germany, this unit operates on a 24V DC, 3W supply and monitors motor standstill by measuring the induced back EMF voltage across two redundant channels. When both channels simultaneously detect a voltage drop to zero, the output relay energizes to indicate standstill. The adjustable voltage threshold accommodates different motor types, and the adjustable delay time (Ts) allows integration across a range of applications.
The contact output configuration consists of 3 N.O. safety contacts and 1 N.C. auxiliary contact, rated B 300 pilot duty. At 40°C, contacts are rated 5A 250Vac G.P. and 5A 24Vdc; at 60°C, ratings are 2A 250Vac G.P. and 2A 24Vdc. The unit carries UL Listing for industrial control equipment (4B51), CE marking, EAC certification, and TV certification as visible on the nameplate. Terminal connections are removable screw type and spring clamp. Lot number 2023/04/24 28195 and PN 533949 are visible on the product label. This item is listed as used surplus and has not been tested by Revelation Machinery.
Please Note: This unit is surplus inventory, sold as-is from MRO Exchange surplus stock. Allen-Bradley is a trademark of Rockwell Automation, Inc. MRO Exchange is an independent reseller and is not an authorized distributor of Rockwell Automation. Product may differ from units available through authorized distributors in date code, country of origin, packaging, accessories, or firmware revision. The warranty from the manufacturer does not apply.
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