125712-01 vs 149986-02 Differences for Bently Nevada 3500/32 4-Channel Relay Module
Bently Nevada 3500/32 4-Channel Relay Module stands as a critical component in asset condition monitoring systems, translating critical alarm signals into actionable responses to protect your most valuable equipment.
A 3500 relay module is a multi-channel module composed of a main card known as the relay controller and a relay output module. The relay controller interfaces with the 3500 system alarming network to process its configured relay drive logic and generate relay channel drive signals. The relay I/O module accepts the relay drive signals from the controller and contains the relay devices which provide the machinery trip contacts.
3500/32 main card ordering number is 125712-01,the upgrade 3500/32M ordering number is 149986-02. What’s the difference? Is the new code 149986-02 can replace of 125712-01?
125712-01 is built to match its exact OEM specs—epoxy-sealed construction, 250 Vrms arc suppressor, and relay contacts rated for 100,000 cycles at 5 A, 24 Vdc/120 Vac. It’s a drop-in fit for the 3500 rack’s full-height front slot, requiring no reconfiguration for legacy setups. 149986-02 is the dedicated spare for the upgraded 3500/32M, designed to support its enhanced features, including SIL 2 functional safety and ATEX/IECEx hazardous area certifications, plus expanded input compatibility for Not-OK and PPL signals alongside standard alarm inputs.
Software and firmware compatibility further set them apart. 125712-01 works with older 3500 Rack Configuration Software versions, needing no minimum rev levels for seamless integration—ideal for facilities that haven’t upgraded their system software. 149986-02 has strict prerequisites: it requires the 3500/22 TDI module (Rev 1.71+ firmware), 3500 Rack Configuration Software (Rev 4.5+), and compatible display module firmware, ensuring the 3500/32M’s advanced logic and safety features function as intended.
Their use cases diverge too: 125712-01 suits standard non-hazardous industrial environments where the original 3500/32’s core alarm logic is sufficient, a cost-effective direct replacement for basic setups. 149986-02 is built for high-stakes applications—hazardous areas, marine systems (DNV GL/ABS certified), and functional safety setups—where the 3500/32M’s regulatory compliance and upgraded performance are mandatory.
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3500/32 125712-01 |
3500/32 149986-02 |
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Inputs Power Consumption |
6watts typical |
5.8 watts typical |
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Contact Life |
100,000 cycles @ 5 A, 24 Vdc or120 Vac. |
100,000 cycles @ 5 A, 24 Vdc or 240 Vac |
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Minimum switched current: |
10mA @ 5 Vdc |
100 mA @ 12 Vdc |
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Max switched current: |
5 A |
2 A @ 0V to 30 Vdc0.75 A @ 48 Vdc0.2 A @ 125 Vdc |
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Max switched power: |
ac:600 VA |
AC: 450VA |
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Hazardous Area Approvals |
CSA/NRTL/C |
ATEX/IECEx/cNRTLus SIL 2 |
Notably, 125712-01 and 149986-02 are genuine Bently Nevada parts but fully non-interchangeable. Installing 149986-02 in a legacy 3500/32 causes functionality issues, while 125712-01 in a 3500/32M compromises safety certifications. The choice boils down to your system version: 125712-01 for classic 3500/32, 149986-02 for advanced 3500/32M. Stocking the matched spare ensures peak system performance, avoids costly mistakes, and keeps your 3500/32 asset monitoring system protecting critical machinery reliably.