Introduction to the Apollo Series 65 Diode Base (45681-201APO)
The Apollo Series 65 diode detector mounting base, model 45681-201APO, is a purpose-built accessory for conventional fire detection loops. Designed for straightforward compatibility with ApolloSeries 65 detectors, the base adds diode functionality—using Schottky diodes on L1 IN and L1 OUT—to enable head-removal and line-monitoring on compatible control equipment. Its compact 100 mm diameter footprint, one-way fit, and optional detector locking make it a practical choice for contractors, facilities managers, and installers working on commercial and residential projects.
Key features at a glance
- Schottky diodes on L1 IN and L1 OUTto support head-removal/line monitoring.
- One-way fitto prevent incorrect insertion of detectors and reduce installation errors.
- Detector locking option(grub screw) for secure, tamper-resistant installations.
- Labelled terminalsfor easy wiring: L1 IN/OUT, L2 IN/OUT, remote indicator negative (-R), Earth.
- Compact mechanical profile— 100 mm diameter and shallow depth suitable for constrained ceiling voids.
- Economicalpricing: low cost of components and modest suggested retail price make it a cost-effective accessory.
Detailed specifications and benefits
The 45681-201APO is engineered primarily as a passive diode mounting base that integrates cleanly into Series 65 conventional loops. Below are the important specifications and the practical benefits they deliver.
- Manufacturer:Apollo
- Part number:45681-201APO
- Product type:Series 65 diode detector mounting base
- Diameter:100 mm
- Depth:Approx. 15 mm (shallow profile for limited ceiling voids)
- Mounting:Standard Series 65 mounting footprint for plug-and-play compatibility with Series 65 detectors
- Diode:Schottky diodes fitted on L1 IN and L1 OUT. Schottky diodes are chosen for their low forward voltage and fast switching characteristics, which help preserve loop signalling performance while enabling line supervision features.
- Terminals:Clearly labelled L1 IN, L1 OUT, L2 IN, L2 OUT, -R (remote indicator negative), and Earth to simplify wiring and reduce installation errors.
- Electrical parts:Passive diode components only (no active electronics), making the base inherently reliable and low-maintenance.
- Compatible detectors:All Apollo Series 65 detectors
- Warranty:10 years manufacturer warranty (refer to Apollo documentation for terms)
- Approvals:Insufficient data available in this listing (consult Apollo datasheet and local authority requirements for certification details)
Benefits: The Schottky diode arrangement supports head-removal and line-monitoring without introducing significant voltage drop, the one-way fit reduces incorrect installations, and the locking option provides security where tamperproofing is required. The labelled terminals and standard footprint speed up installation and reduce potential wiring mistakes, which is particularly valuable on larger jobs or retrofits.
Use cases and scenarios where the product excels
The Apollo Series 65 diode base is particularly useful in several practical scenarios:
- Conventional loop installations where head-removal monitoring is required:In commercial and multi-occupancy residential buildings, it is common for control panels to monitor continuity of detectors. The diode base enables the control equipment to detect when a detector head has been removed or if a section of the loop becomes open circuit.
- Circuits shared with manual call points or other devices:Where manual call points and detector bases share a single conventional loop, the diode arrangement helps the panel distinguish wiring faults, improving diagnostic clarity and reducing nuisance faults.
- Retrofitting older systems:The shallow depth and standard Series 65 mounting make this base suited to retrofit projects where ceiling voids are limited and where existing wiring footprints are retained.
- High-security or public access areas:The optional grub screw detector locking mechanism is beneficial in schools, retail environments, and public facilities where inadvertent or malicious removal of detector heads must be prevented.
- Economical installations:The base provides diode functionality without the expense of a fully monitored addressable detector system, making it a cost-effective option for budgets that require line supervision but remain on conventional loops.
Comparisons with similar products on the market
When choosing a diode detector base, installers typically compare features such as diode type, mechanical footprint, wiring clarity, locking options, and price. Hereare some points of comparison to help position the Apollo 45681-201APO:
Schottky diodes, as used in the Apollo base, have lower forward voltage than standard silicon diodes. This translates to slightly better preservation of loop voltage and more reliable signalling for panels that rely on subtle voltage changes for supervision. Some competing bases use standard silicon diodes which can introduce higher forward voltage drops; others may use alternative diode configurations for similar monitoring functions. The ApolloSchottky implementation is a practical balance between performance and cost.
The 100 mm diameter and Series 65 mounting ensure compatibility with Apollo detectors and many retrofit scenarios. Competing bases from other manufacturers (e.g., generic diode bases or proprietary formats) may have different footprints or mounting patterns, potentially requiring adaptors or rewiring. In markets where Series 65 detectors are already used, the Apollo base avoids those compatibility headaches.
The grub screw locking option is common across many professional bases; the Apollo base provides this in a straightforward and familiar way. Some higher-end bases include tool-required release mechanisms or keyed locks for extra security, while more economical models may omit locking entirely. The Apollo option sits comfortably in the middle, offering practical protection without excessive cost.
With a modest suggested retail price, the Apollo diode base offers good value for contractors and specifiers who need diode monitoring without the expense of an addressable upgrade. Compared to fully monitored bases or manufacturer-branded advanced bases, diode-fitted conventional bases like the 45681-201APO tend to be significantly less expensive while delivering essential supervision features.
Customer feedback and installer impressions
There are no specific named customer testimonials provided in this listing. However, typical installer and contractor feedback for diode mounting bases of this design generally highlights the following points:
- Positive:Easy wiring due to labelled terminals, straightforward fit with Series 65 detectors, and the convenience of the one-way fit to avoid mistakes. Installers also appreciate the shallow depth in tight ceiling voids and the long manufacturer warranty.
- Practical suggestions:Always consult the control panel manual to confirm compatibility for head-removal/line monitoring and ensure the panel expects Schottky diode arrangements. Some teams recommend pre-testing the loop with the base fitted to confirm expected supervision thresholds.
- Caveats:As with all conventional diode bases, the level of supervision is limited compared with fully addressable detector systems. For projects requiring detailed event logging and advanced diagnostics, an addressable solution would be preferred.
Installation notes and compliance reminders
When installing the Apollo Series 65 diode base, follow standard safety and regulatory practices: isolate circuits before working, use the labelled terminals to avoid cross-connections, and keep documentation (datasheets, panel wiring diagrams) to hand. The product listing indicates a 10-year manufacturer warranty, but approvals were not specified here, so always check the official Apollo datasheet and local regulatory requirements (for example BS5839 guidance in the UK) to confirm suitability for your installation.
Conclusion: Why choose the Apollo 45681-201APO diode base?
The Apollo Series 65 diode base (45681-201APO) is a practical, economical accessory for conventional fire detection loops that require head-removal and line-monitoring capability. Its Schottky diode configuration, clear wiring labels, one-way fit, and optional locking combine to deliver a user-friendly installation experience and reliable field performance. The compact footprint and shallow depth make it especially well suited to retrofit work and constrained ceiling spaces. Backed by a 10-year manufacturer warranty and priced competitively, it represents strong value for contractors and specifiers working within the Apollo Series 65 ecosystem.
For precise wiring diagrams, approvals, and full technical details, always consult the official Apollo datasheet and the control panel manufacturerdocumentation before installation.
